APA (7th ed.) Citation

Reis, H. T., & Sprecher, S. (2009). Encyclopedia of human relationships. SAGE.

Chicago Style (17th ed.) Citation

Reis, Harry T., and Susan Sprecher. Encyclopedia of Human Relationships. Los Angeles, [Calif.] ; London: SAGE, 2009.

MLA (9th ed.) Citation

Reis, Harry T., and Susan Sprecher. Encyclopedia of Human Relationships. SAGE, 2009.