APA (7th ed.) Citation

Knowles, M. S.. (1990). The adult learner: A neglected species (4th ed.). Gulf Pub..

Chicago Style (17th ed.) Citation

Knowles, Malcolm Shepherd. The Adult Learner: A Neglected Species. 4th ed. Houston, Tex.: Gulf Pub., 1990.

MLA (9th ed.) Citation

Knowles, Malcolm Shepherd. The Adult Learner: A Neglected Species. 4th ed. Gulf Pub., 1990.

Warning: These citations may not always be 100% accurate.