Cita APA (7th ed.)

Voice of America & Roller, D. H. D. (1964). The voice of America forum lectures.

Cita Chicago (17th ed.)

Voice of America i Duane H. D. Roller. The Voice of America Forum Lectures. [Washington, 1964.

Cita MLA (9th ed.)

Voice of America i Duane H. D. Roller. The Voice of America Forum Lectures. 1964.