APA (7th ed.) Citation

Simpson, J. A., Wood, W., & Worchel, S. (1992). Group process and productivity. Sage Publications.

Chicago Style (17th ed.) Citation

Simpson, Jeffry A., Wendy Wood, and Stephen Worchel. Group Process and Productivity. Newbury Park, Calif: Sage Publications, 1992.

MLA (9th ed.) Citation

Simpson, Jeffry A., et al. Group Process and Productivity. Sage Publications, 1992.