APA

Funk W. J., Lewis N., . (1970). 30 days to a more powerful vocabulary. New York: Funk & Wagnalls.

Chicago

Funk Wilfred John, Lewis Norman, . 1970. 30 days to a more powerful vocabulary. New York: Funk & Wagnalls.

Harvard

Funk W. J., Lewis N., . (1970). 30 days to a more powerful vocabulary. New York: Funk & Wagnalls.

MLA

Funk Wilfred John, Lewis Norman, . 30 days to a more powerful vocabulary. New York: Funk & Wagnalls. 1970.