Cita APA (7th ed.)

Cram, D. (1961). Explaining teaching machines' and programming. Fearon Publishers.

Cita Chicago (17th ed.)

Cram, David. Explaining Teaching Machines' and Programming. San Francisco, Calif: Fearon Publishers, 1961.

Cita MLA (8th ed.)

Cram, David. Explaining Teaching Machines' and Programming. Fearon Publishers, 1961.