Repp, A. C. (1983). Teaching the mentally retarded. Prentice-Hall.
Dyfyniad Arddull ChicagoRepp, Alan C. Teaching the Mentally Retarded. Englewood Cliffs, N.J.: Prentice-Hall, 1983.
Dyfyniad MLARepp, Alan C. Teaching the Mentally Retarded. Prentice-Hall, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.