Hull, Clark Leonard, Principles of behavior : An introduction to behavior theory / by Clark L. Hull - New York : D. Appleton-Century Company, incorporated, 1943. - x p., 1 l., 422 p., 1 l. illus., diagrs. - The Century psychology series . "References" at end of each chapter. Subjects--Topical Terms: Behavior Dewey Class. No.: 150.1943 / HUL