APA (7th ed.) Citation

Knowles, M. S., Holton, E. F., & Swanson, R. A. (1998). The adult learner: The definitive classic in adult education and human resource development (5. ed.). Gulf.

Chicago Style (17th ed.) Citation

Knowles, Malcolm S., Elwood F. Holton, and Richard A. Swanson. The Adult Learner: The Definitive Classic in Adult Education and Human Resource Development. 5. ed. Houston: Gulf, 1998.

MLA (9th ed.) Citation

Knowles, Malcolm S., et al. The Adult Learner: The Definitive Classic in Adult Education and Human Resource Development. 5. ed. Gulf, 1998.