Knowles, Malcolm S. 1913-1997. The adult learner : a neglected species / Malcolm Knowles. - 4th ed. - Houston : Gulf Pub. Co, 1990. - viii, 292 p. : ill. ; 24 cm. - Building blocks of human potential series. . ISBN: 0872010740 LCCN: 89048697 Subjects--Topical Terms: Adult education. Dewey Class. No.: 374