APA (7th ed.) Citation
Pei, M. (1969). What's in a word?: Language: yesterday, today, and tomorrow. Hawthorn Books.
Chicago Style (17th ed.) Citation
Pei, Mario. What's in a Word?: Language: Yesterday, Today, and Tomorrow. New York, USA: Hawthorn Books, 1969.
MLA (9th ed.) Citation
Pei, Mario. What's in a Word?: Language: Yesterday, Today, and Tomorrow. Hawthorn Books, 1969.
Warning: These citations may not always be 100% accurate.