APA (7th ed.) Citation

O'Brien, D., & Pitts, D. V. (2001). Korn shell programming by example. Que.

Chicago Style (17th ed.) Citation

O'Brien, Dennis, and David V. Pitts. Korn Shell Programming by Example. Indianapolis, Ind: Que, 2001.

MLA (9th ed.) Citation

O'Brien, Dennis, and David V. Pitts. Korn Shell Programming by Example. Que, 2001.