Research to practice in mental retardation [proceedings of the] Fourth Congress of the International Association for the Scientific Study of Mental Deficiency, [Washington, D.C., 22-27 August 1976, the American University] 
International Association for the Scientific Study of Mental DeficiencyCongress4th1976Washington, D.C.
Mittler, Peter J.
De Jong, Jean Marie Baptiste Vianney.
Baltimore London University Park Press,
1977
Includes bibliographies and index
Mental retardation.