Freeman, J. L., Peplau, A., & Sears, D. O. Social psychology. New York: Prentice-Hall.

Freeman, Jonathan L., Anne Peplau, و David O. Sears. Social Psychology. New York: Prentice-Hall.

Freeman, Jonathan L., Anne Peplau, و David O. Sears. Social Psychology. New York: Prentice-Hall.