1- Kretschmer, M., & Storm, L. (2018). The relationships of the five existential concerns with depression and existential thinking. International Journal of Existential Psychology and Psychotherapy, 7(1), 20.

2- Gardner, H. E. (2000). Intelligence reframed: Multiple intelligences for the 21st century. Hachette UK.

3- LeSueur, I. (2019). An Investigation of Existential and Positive Psychological Resources in College Students.

4- Pandya, S. P. (2018). Auroville as an intentional spiritual community and the practice of Integral yoga. Cogent Arts & Humanities, (just-accepted).

5- Gardner, H. (2000). A case against spiritual intelligence. The international journal for the psychology of religion, 10(1), pp. 27-34.

6- Gardner, H. (2011). Frames of mind: The theory of multiple intelligences. Hachette UK.

7- Allan, B. A., & Shearer, B. (2012). The scale for existential thinking. International Journal of Transpersonal Studies, 31(1), 5.

8- Halama, P., & Strizenec, M. (2004). SPIRITUAL, EXISTENTIAL OR BOTH? THEORETICAL CONSIDERATIONS ON THE NATURE OF HIGHER INTELLIGENCES (DISCUSSION). Studia psychologica, 3(46), PP. 239-253.

9- Emmons, R. A. (2000). Is spirituality an intelligence? Motivation, cognition, and the psychology of ultimate concern. The International Journal for the psychology of Religion, 10(1), pp. 3-26.

10- Pedersen, H. F., Birkeland, M. H., Jensen, J. S., Schnell, T., Hvidt, N. C., Sørensen, T., & la Cour, P. (2018). What brings meaning to life in a highly secular society? A study on sources of meaning among Danes. Scandinavian journal of psychology, 59(6), pp. 678-690.

11- Schulenberg, S. E., Schnetzer, L. W., & Buchanan, E. M. (2011). The purpose in life test-short form: development and psychometric support. Journal of Happiness Studies, 12(5), pp. 861-876.

12- Steger, M. F., Frazier, P., Oishi, S., & Kaler, M. (2006). The meaning in life questionnaire: Assessing the presence of and search for meaning in life. Journal of counseling psychology, 53(1), 80.

13- Hill, C. E., Kline, K. V., Miller, M., Marks, E., Pinto-Coelho, K., & Zetzer, H. (2019). Development of the Meaning in Life measure. Counselling Psychology Quarterly, 32(2), pp. 205-226.

14- Rizzo, M., Testa, S., Gattino, S., & Miglietta, A. (2019). Flexibility in Existential Beliefs and Worldview: Testing Measurement Invariance and Factorial Structure of the Existential Quest Scale in an Italian Sample of Adults. Frontiers in psychology, 10, 2134.

15- van Bruggen, V., ten Klooster, P., Westerhof, G., Vos, J., de Kleine, E., Bohlmeijer, E., & Glas, G. (2017). The Existential Concerns Questionnaire (ECQ)–development and initial validation of a new existential anxiety scale in a nonclinical and clinical sample. Journal of clinical psychology, 73(12), pp.1692-1703.

16- van Bruggen, V., Vos, J., Westerhof, G., Bohlmeijer, E., & Glas, G. (2015). Systematic review of existential anxiety instruments. Journal of humanistic psychology, 55(2), pp. 173-201.

17- Jans-Beken, L., & Wong, P. T. (2019). Development and preliminary validation of the Existential Gratitude Scale (EGS). Counselling Psychology Quarterly, pp. 1-15.

18- Kira, I., Shuwiekh, H., Kucharska, J., & Al-Huwailah, A. (2019). The Integrated structural and measurement Models of existential annihilation anxieties (EAA) and their potential contribution to clinical science: Two studies on Western and Non-Western samples. Psychology, 10(4), pp. 449-480.

19- Narasimhan, N., Bhaskar, K., & Prakhya, S. (2010). Existential beliefs and values. Journal of Business Ethics, 96(3), pp. 369-382.

20-Reker, G. T., & Peacock, E. J. (1981). The Life Attitude Profile (LAP): A multidimensional instrument for assessing attitudes toward life. Canadian Journal of Behavioural Science/Revue canadienne des sciences du comportement, 13(3), 264.

21- Shearer, C. B. (2006). Development and validation of a scale for existential thinking. Unpublished manuscript. Kent State University, OH.

22- Nobandegani, Z. N., Nejad, P. Y., Golmohammadian, M., & Ahmadi, T. (2015). Investigation of the Relationship between Identity Styles, Identity Commitment and Existential Thinking among Students.

23- کوثری، فرزانه، اسماعیلی­نسب، مریم (1397). هنجاریابی مقدماتی مقیاس واکنشهای والدین به هیجانات
مثبت کودکان. روانشناسی بالینی و شخصیت. دوره 16، شماره 2، صص237-225.

24- Hoffman, L. E., Yang, M. E., Kaklauskas, F. J., & Chan, A. E. (2009). Existential psychology East-West. University of the Rockies Press.

25- Bryant, F. B., & Yarnold, P. R. (1995). Principal-components analysis and exploratory and confirmatory factor analysis.

26- Moradipour, S., Soleimani, M. A., Mafi, M., & Sheikhi, M. R. (2019). Effect of Benson’s relaxation technique on death anxiety among patients with breast cancer. Journal of hayat, 24(4), pp. 355-367.

27- Templer, D. I. (1970). The construction and validation of a death anxiety scale. The Journal of general psychology, 82(2), pp. 165-177.

28- Rajabi   GH,   Bohrani   M.   Factorial analysis of death anxiety scale.  Psychol J2001; 4: pp. 331-44.

29- Jami, M., & Shahabizadeh, F. (2018). Examination of emotional intelligence in codification of job stress model among physicians: the mediating role of existential anxiety. Journal of Research and Health, 8(1), pp. 52-60.

30- Good, L. R., & Good, K. C. (1974). A preliminary measure of existential anxiety. Psychological Reports, 34(1), pp. 72-74.

31- هومن، حیدرعلی، رضایی، نورمحمد، رضایی، علی­محمد، شهریاراحمدی، منصوره و براتیان، مسعود (1390). بررسی پایایی و روایی مقیاس اضطراب هستی در بین دانش­آموزان مقطع متوسطه استان ایلام. نشریه اندازه­گیری تربیتی، دوره 2، شماره 6.

32- Chan, A. W., & Siu, A. F. (2016). Application of the spiritual intelligence self-report inventory (SISRI-24) among Hong Kong university students. International Journal of Transpersonal Studies, 35(1), 3.

33- سادات رقیب، مائده، سیادت، حکیمی نیا، بهزاد، احمدی،  سید جعفر. (2011). اعتباریابی مقیاس هوش معنوی کینگ (SISRI-24) در دانشجویان دانشگاه اصفهان. دست آوردهای روان شناختی، دوره 17، شماره 1، صص 141-164.

34- Dev, R. D. O., Kamalden, T. F. T., Geok, S. K., Abdullah, M. C., Ayub, A. F. M., & Ismail, I. A. (2018). Emotional Intelligence, Spiritual Intelligence, SelfEfficacy and Health Behaviors: Implications for Quality Health. International Journal of Academic Research in Business and Social Sciences, 8(7), 794-809.

35- King, D. B. (2007). The spiritual intelligence project. Trent Univ, Canada.

36- Alexopoulos, D. S., & Kalaitzidis, I. (2004). Psychometric properties of Eysenck personality questionnaire-revised (EPQ-R) short scale in Greece. Personality and individual Differences, 37(6), 1205-1220.

37- Tabachnick, B. G., Fidell, L. S., & Ullman, J. B. (2007). Using multivariate statistics (Vol. 5, pp. 481-498). Boston, MA: Pearson.

38- Miguel, J. P., da Silva, J. T., & Machado, T. S. (2015). Escala de Pensamento Existencial: análise Rasch da versão Portuguesa. Revista de Estudios e Investigación en Psicología y Educación, 045-049.

39- Amram, Y. (2007, August). The seven dimensions of spiritual intelligence: An ecumenical, grounded theory. In 115th Annual Conference of the American Psychological Association, San Francisco, CA (pp. 1-8).

40- Vasconcelos, A. F. (2020). Spiritual intelligence: a theoretical synthesis and work-life potential linkages. International Journal of Organizational Analysis.

41- Farias, M., Newheiser, A. K., Kahane, G., & de Toledo, Z. (2013). Scientific faith: Belief in science increases in the face of stress and existential anxiety. Journal of experimental social psychology, 49(6), 1210-1213.

42- Giannone, D. A., Kaplin, D., & Francis, L. J. (2019). Exploring two approaches to an existential function of religiosity in mental health. Mental Health, Religion & Culture, 22(1), 56-72.

43- Routledge, C., & Juhl, J. (2010). When death thoughts lead to death fears: Mortality salience increases death anxiety for individuals who lack meaning in life. Cognition and Emotion, 24(5), 848-854.

44- Steger, M. F., Mann, J. R., Michels, P., & Cooper, T. C. (2009). Meaning in life, anxiety, depression, and general health among smoking cessation patients. Journal of psychosomatic research, 67(4), 353-358.