Cita APA (7a ed.)

Funk, W. J., & Lewis, N. (1970). 30 days to a more powerful vocabulary (Newly rev. by Norman Lewis.). Pocket Books.

Cita Chicago Style (17a ed.)

Funk, Wilfred John, y Norman Lewis. 30 Days to a More Powerful Vocabulary. Newly rev. by Norman Lewis. New York: Pocket Books, 1970.

Cita MLA (9a ed.)

Funk, Wilfred John, y Norman Lewis. 30 Days to a More Powerful Vocabulary. Newly rev. by Norman Lewis. Pocket Books, 1970.