APA (7th ed.) Citation

Keller, F. S., & Sherman, J. G. (1974). PSI, the Keller plan handbook: Essays on a personalized system of instruction. W. A. Benjamin.

Chicago Style (17th ed.) Citation

Keller, Fred Simmons, and J. Gilmour Sherman. PSI, the Keller Plan Handbook: Essays on a Personalized System of Instruction. Menlo Park, Calif.: W. A. Benjamin, 1974.

MLA (8th ed.) Citation

Keller, Fred Simmons, and J. Gilmour Sherman. PSI, the Keller Plan Handbook: Essays on a Personalized System of Instruction. W. A. Benjamin, 1974.