APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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