Liu, Xuejiao: Recenze na: Mental retardation (fourth edition). Mary Beirne-Smith, James R. Patton, and Richard Ittenbach (1994) | Bierne-Smith, Mary, Ittenbach, Richard, & Patton, James R. (1994). Mental retardation | New York, USA: Macmillan College Publishing Company, 636 pp. | ISBN: 0023078839