Funk, W. J., & Lewis, N. (1970). 30 days to a more powerful vocabulary (Newly rev. by Norman Lewis.). Pocket Books.
Lua i Stíl Chicago (17ú heag.)Funk, Wilfred John, agus Norman Lewis. 30 Days to a More Powerful Vocabulary. Newly rev. by Norman Lewis. New York: Pocket Books, 1970.
Lua MLA (9ú heag.)Funk, Wilfred John, agus Norman Lewis. 30 Days to a More Powerful Vocabulary. Newly rev. by Norman Lewis. Pocket Books, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.