APA (7th ed.) Citation

Frankel, M. G., Happ, F. W., & Smith, M. P. (1975). Functional teaching of the mentally retarded (2. ed.). Thomas.

Chicago Style (17th ed.) Citation

Frankel, Max G., F. W. Happ, and Maurice P. Smith. Functional Teaching of the Mentally Retarded. 2. ed. Springfield, Ill: Thomas, 1975.

MLA (9th ed.) Citation

Frankel, Max G., et al. Functional Teaching of the Mentally Retarded. 2. ed. Thomas, 1975.