APA (7th ed.) Citation

Diringer, D. (1948). The Alphabet. A Key to the History of Mankind.

Chicago Style (17th ed.) Citation

Diringer, D. The Alphabet. A Key to the History of Mankind. London, 1948.

MLA (8th ed.) Citation

Diringer, D. The Alphabet. A Key to the History of Mankind. 1948.