Cita APA (7th ed.)

Spencer, R. E. (1980). Investigating the use of the personalized system of instruction in distance education. Athabasca University.

Cita Chicago (17th ed.)

Spencer, Robert E. Investigating the Use of the Personalized System of Instruction in Distance Education. Edmonton, Alta.: Athabasca University, 1980.

Cita MLA (8th ed.)

Spencer, Robert E. Investigating the Use of the Personalized System of Instruction in Distance Education. Athabasca University, 1980.