APA
Proceedings of symosia (4-5 : 31-1-and : Middlesex), . (1972). Learning, speech and thought in the mentally retarded ed by A D B Clarke and M M Lewis. London: Butterworths.
Chicago
Proceedings of symosia (4-5 : 31-1-and : Middlesex), . 1972. Learning, speech and thought in the mentally retarded ed by A D B Clarke and M M Lewis. London: Butterworths.
Harvard
Proceedings of symosia (4-5 : 31-1-and : Middlesex), . (1972). Learning, speech and thought in the mentally retarded ed by A D B Clarke and M M Lewis. London: Butterworths.
MLA
Proceedings of symosia (4-5 : 31-1-and : Middlesex), . Learning, speech and thought in the mentally retarded ed by A D B Clarke and M M Lewis. London: Butterworths. 1972.
