APA (7th ed.) Citation

Knowles, M. S. (1979). The adult learner: A neglected species (2.ed.; 2.print.). Gulf Publ.Co.

Chicago Style (17th ed.) Citation

Knowles, Malcolm S. The Adult Learner: A Neglected Species. 2.ed.; 2.print. Houston, Tex: Gulf Publ.Co, 1979.

MLA (9th ed.) Citation

Knowles, Malcolm S. The Adult Learner: A Neglected Species. 2.ed.; 2.print. Gulf Publ.Co, 1979.