APA (7th ed.) Citation

Kay, J., & Kummerfeld, B. (1989). C programming in a Unix environment. Addison-Wesley.

Chicago Style (17th ed.) Citation

Kay, Judy, and Bob Kummerfeld. C Programming in a Unix Environment. Sydney u.a: Addison-Wesley, 1989.

MLA (9th ed.) Citation

Kay, Judy, and Bob Kummerfeld. C Programming in a Unix Environment. Addison-Wesley, 1989.

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