Perry, N. (1974). Teaching the mentally retarded child (2d ed., enl.). Columbia University Press.
Cita Chicago (17th ed.)Perry, Natalie. Teaching the Mentally Retarded Child. 2d ed., enl. New York: Columbia University Press, 1974.
Cita MLA (8th ed.)Perry, Natalie. Teaching the Mentally Retarded Child. 2d ed., enl. Columbia University Press, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.