Cita APA (7th ed.)
Funk, W., & Lewis, N. 30 Days to a More Powerful Vocabulary. Pocket Books.
Cita Chicago (17th ed.)
Funk, Wilfred, i Norman Lewis. 30 Days to a More Powerful Vocabulary. Nueva York, EUA: Pocket Books.
Cita MLA (9th ed.)
Funk, Wilfred, i Norman Lewis. 30 Days to a More Powerful Vocabulary. Pocket Books.
Atenció: Aquestes cites poden no estar 100% correctes.