APA (7th ed.) Citation

Gale Group, Reis, H. T., & Sprecher, S. (2009). Encyclopedia of human relationships. Sage Publications.

Chicago Style (17th ed.) Citation

Gale Group, Harry T. Reis, and Susan Sprecher. Encyclopedia of Human Relationships. Thousand Oaks, Calif: Sage Publications, 2009.

MLA (9th ed.) Citation

Gale Group, et al. Encyclopedia of Human Relationships. Sage Publications, 2009.