Hull, Clark Leonard, 1884-1952 Principles of behavior; an introduction to behavior theory. - New York : Appleton-Century-Crofts, 1943 - xxii, 422 p. : illus. ; 21 cm. - The Century psychology series . Includes bibliographies. Subjects--Topical Terms: Behaviorism (Psychology) LC Class. No.: BF199 / .H77 1943