Cherry, K. (2018). Characteristics of Ego Strength. VeryWell Mind.
Diener, E. and Fujita, F. (1995). Resources, personal strivings, and subjective well-being: A nomothetic and idiographic approach. J. Pers. Soc. Psychol. 68: 926–935.Friedman, W. J. (n.d.). Building Strong Internal Resources: A Key To Well Being. MentalHelp.
Lavee, Y. & Olson, D. H. (1993). Seven types of marriage: Empirical typology based on ENRICH. Journal of marital and family therapy. 19. 325-40.
Lundman, B., Aléx, L., Jonsén, E., Norberg, A., Nygren, B., Santamäki Fischer, R., & Strandberg, G. (2010). Inner strength—A theoretical analysis of salutogenic concepts. International Journal of Nursing Studies, 47(2), 251-260.
Myers, D., and Diener, E. (1995). Who is happy? Psychol. Sci. 6: 10–19.
Notes on Symbol Formation.
Segal, H. (1957). Notes on Symbol Formation. International Journal of Psycho-Analysis, 38. 391-397.
Waddell, M. (2002). Inside lives: Psychoanalysis and the growth of the personality. London: Karnac.