APA Edition Citation

Norman Lewis & Wilfred Funk. 30 Days to a more powerful vocabulary. New York.

Chicago Edition Citation

Norman Lewis and Wilfred Funk. 30 Days to a More Powerful Vocabulary. New York.

MLA Edition Citation

Norman Lewis and Wilfred Funk. 30 Days to a More Powerful Vocabulary. New York.

Warning: These citations may not always be 100% accurate.