APA (7th ed.) Citation

Diringer, D., & Regensburger, R. (1968). The alphabet: A key to the history of mankind (3d ed.). Funk & Wagnalls.

Chicago Style (17th ed.) Citation

Diringer, David, and Reinhold Regensburger. The Alphabet: A Key to the History of Mankind. 3d ed. New York: Funk & Wagnalls, 1968.

MLA (9th ed.) Citation

Diringer, David, and Reinhold Regensburger. The Alphabet: A Key to the History of Mankind. 3d ed. Funk & Wagnalls, 1968.