Cita APA (7a ed.)

Skinner, B. F. (1961). Why we need teaching machines. [s.n.].

Cita Chicago Style (17a ed.)

Skinner, B. F. Why We Need Teaching Machines. [S.l.]: [s.n.], 1961.

Cita MLA (9a ed.)

Skinner, B. F. Why We Need Teaching Machines. [s.n.], 1961.