APA
(1969). Mental Retardation: Proceedings of the Association Dec.11 and 12, 1959 NewYork. : Hafner Publishing Company.
Chicago
1969. Mental Retardation: Proceedings of the Association Dec.11 and 12, 1959 NewYork. : Hafner Publishing Company.
Harvard
(1969). Mental Retardation: Proceedings of the Association Dec.11 and 12, 1959 NewYork. : Hafner Publishing Company.
MLA
Mental Retardation: Proceedings of the Association Dec.11 and 12, 1959 NewYork. : Hafner Publishing Company. 1969.
