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
In 3 vols
Includes bibliographies and index
Mental retardation.