Patton, James R. Mental retardation / James R. Patton, James S. Payne, Mary Beirne Smith ... - 2nd ed. - Columbus ; Toronto : A Bell & Howell Co., c1986. - ix, 595 p. : ill. ports. ; 22 cm. Includes a summary Subjects--Topical Terms: Mental Retardation National Library of Medicine Call No.: WM 300 / P278m 1986