By Isaacson, Robert L..
Buenos Aires Editorial Paidós 1975 .
120 p. , Translaiton of : The mentally retarded child.

By Hutt, Max L..
New York Harper & Row 1966 .
xii, 430 p. 24 cm..

New York Harper & Row 1971 .
vi, 295 p. , Accompanied to Study Guide.

Madrid : Taller de Ediciones Josefina Betancor , 1974 .
417 p. , Translation of: A primer of physiological psychology. 22 cm..
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