Borgatta, Edgar F. & Montgomery, Rhonda J. V (2000) Encyclopedia of Sociology, 2nd edition, USA: Macmillan Reference
Schwartz, Shalom (1994) Are there universal aspects in the structure and contents of human values? Journal of Social Issues, 50, 19p45.
Schwartz, Shalom (2006) Basic Human Values: An Overview ـ Theory, measurement, and applications.
Zsolnai, Laszlo(1998) Rational Choice and the Diversity of Choices Journal of Socio ـ Economics 1998. No. 5. pp. 613 ـ 622.
Morgan، D،H ،J (1975) S ocial Theory and the fammily، London، Routledge and kegan paul.