APA (7th ed.) Citation

Knowles, M. S. (2005). The adult learner: The definitive classic in adult education and human resource development (6th ed.). Elsevier.

Chicago Style (17th ed.) Citation

Knowles, Malcolm S. The Adult Learner: The Definitive Classic in Adult Education and Human Resource Development. 6th ed. Amsterdam: Elsevier, 2005.

MLA (9th ed.) Citation

Knowles, Malcolm S. The Adult Learner: The Definitive Classic in Adult Education and Human Resource Development. 6th ed. Elsevier, 2005.