Kaplan, Robert M.; Saccuzzo, Dennis P. (2009). Psychological Testing: Principles, Applications, and Issues (Seventh ed.). Belmont (CA): Wadsworth. p. 262 (citing Wechsler (1958) The Measurement and Appraisal of Adult Intelligence). ISBN978-0-495-09555-2. 非専門家向けの内容要旨 (9 November 2010)