Amato, P. R. (2000). The consequences of divorce for adult and children, Journal of Marriage & Family , 62(4), 19-26.
Arthur, K. B. (2008). Attachment styles and Enneagram types: Developing and testing of an integrated typology for use in marriage and family therapy, Ph.D Dissertation, Virginia Polytechnic institute and State University.
Donnellan, M., Conger, R. & Bryant, C. (2004).The big five and enduring marriages, Journal of Res Pres, 38, 481- 504.
Broadwell, D. & Light, K. C. (2005). Hostility, conflict and cardiovascular response in married couple: a focuses on the dyad, Department of Health &Human Services, 12,142-152.
Chen, Z. Tanak, N. , Hiramura, H., & Shikai, N.(2007). The role of personalities in the martial adjustment of Japanese couples.Journal of Social Behavior and Personality, 557-561.
Eckstein. D. (2002). The couple's Enneagram questionnaire (CEQ), The Family Journal: Counseling and Therapy for Couples and Families, 10, 101-108.
Friedman. M., & Roseman. R. (1974). Type A behavior and your heart, New York: Knopf. Friedman. M. (1996). Type A behavior: Its diagnosis and treatment. New York.
Plenum press. Grodnor, B. (2002). Using hypnotic language patterns to enhance energy psychotherapy, In F.P. Gallo (Ed.) Energy psychology in psychotherapy: A comprehensive sourcebook, New York: Norton & Company.
Gunt, R. (2006). Couple similarity and martial satisfaction: Are similar spouses happier? Journal of Personality, 74, 5-10
Gottman, J. M. (2002). Marital research the 21th century, Family Process, 41(2),159 Matise, M. (2007). The Enneagram: An innovative approach, Journal of Professional Counseling: Practice, Theory & Research, 35, 38-58.
Lue, S.,& Klohnen, E.(2005). Quality in newlyweds: A couple centered approach, Journal of Pres Social Psychology, 88, 304-326.
Shiota, N., & Levenson, W. (2007). Birds of a feather don't always fly farthest: Similarity in big five personality predicts more negative marital satisfaction trajectories in long-term marriages, Psychology Aging, 22, 666- 675.
Tolk, L. S. (2006). Integrating the Enneagram and schema therapy: Bringing the soul into psychotherapy, Dissertation Abstract International, 67(2), 1172.
Totton. N. & Jacobs, M. (2001). Character and Personality Types, Philadelphia, PA: Open University Press.