APA (7th ed.) Citation
Asente, P. J., & Swick, R. R. (1990). X Window system Toolkit: The complete programmer's guide and specification. X version 11, release 4 (2.ed.). Digital Press.
Chicago Style (17th ed.) Citation
Asente, Paul J., and Ralph R. Swick. X Window System Toolkit: The Complete Programmer's Guide and Specification. X Version 11, Release 4. 2.ed. Massachusetts: Digital Press, 1990.
MLA (9th ed.) Citation
Asente, Paul J., and Ralph R. Swick. X Window System Toolkit: The Complete Programmer's Guide and Specification. X Version 11, Release 4. 2.ed. Digital Press, 1990.
Warning: These citations may not always be 100% accurate.