APA (7th ed.) Citation

Knowles, M. (1978). The adult learner: A neglected species (2nd ed.). Gulf Publishing Company Book Division.

Chicago Style (17th ed.) Citation

Knowles, Malcom. The Adult Learner: A Neglected Species. 2nd ed. Houston: Gulf Publishing Company Book Division, 1978.

MLA (9th ed.) Citation

Knowles, Malcom. The Adult Learner: A Neglected Species. 2nd ed. Gulf Publishing Company Book Division, 1978.