Cita APA (7a ed.)

Funk, W., & Lewis, N. D. (1943). 30 Days to a more powerful vocabulary. Funk, Wilfred.

Cita Chicago Style (17a ed.)

Funk, Wilfred, y Nolan D.C Lewis. 30 Days to a More Powerful Vocabulary. New York: Funk, Wilfred, 1943.

Cita MLA (8a ed.)

Funk, Wilfred, y Nolan D.C Lewis. 30 Days to a More Powerful Vocabulary. Funk, Wilfred, 1943.