Gulliksen, Harold. Theory of mental tests / Harold Gulliksen. - New York : Wiley, c1950 [Printing 1967]. - xix, 486 p. : ill. ; 23 cm. - Wiley publications in psychlogy . Includes index. Subjects--Topical Terms: Psychological tests.Psychological tests--Evaluation. Dewey Class. No.: 153.93 / GUT 1967