APA (7th ed.) Citation

Pei, . M. (1973). How to learn languages and what languages to learn (Enlarged ed.). Harper & Row.

Chicago Style (17th ed.) Citation

Pei, Mario. How to Learn Languages and What Languages to Learn. Enlarged ed. New York: Harper & Row, 1973.

MLA (9th ed.) Citation

Pei, Mario. How to Learn Languages and What Languages to Learn. Enlarged ed. Harper & Row, 1973.

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