APA (7th ed.) Citation

Nye, A., & O'Reilly, T. (1990). X toolkit intrinsics programming manual: The definitive guides to the X Window System. O'Reilly & Associates.

Chicago Style (17th ed.) Citation

Nye, Adrian, and Tim O'Reilly. X Toolkit Intrinsics Programming Manual: The Definitive Guides to the X Window System. [Sebastopol, CA]: O'Reilly & Associates, 1990.

MLA (9th ed.) Citation

Nye, Adrian, and Tim O'Reilly. X Toolkit Intrinsics Programming Manual: The Definitive Guides to the X Window System. O'Reilly & Associates, 1990.