Cita APA (7a ed.)

Roberts, P. (1967). The Roberts English Series: A linguistics program. Harcourt, Brace & World.

Cita Chicago Style (17a ed.)

Roberts, Paul. The Roberts English Series: A Linguistics Program. New York, Estados Unidos: Harcourt, Brace & World, 1967.

Cita MLA (9a ed.)

Roberts, Paul. The Roberts English Series: A Linguistics Program. Harcourt, Brace & World, 1967.