APA (7th ed.) Citation

Lenning, O. T., Beal, P. E., & Sauer, K. (1980). Retention and attrition: Evidence for action and research. National Center for Higher Education Management Systems.

Chicago Style (17th ed.) Citation

Lenning, Oscar T., Philip E. Beal, and Ken Sauer. Retention and Attrition: Evidence for Action and Research. Boulder, Colo.: National Center for Higher Education Management Systems, 1980.

MLA (9th ed.) Citation

Lenning, Oscar T., et al. Retention and Attrition: Evidence for Action and Research. National Center for Higher Education Management Systems, 1980.