APA (7th ed.) Citation

O'Reilly, T., & Quercia, V. (1990). X Window System User's Guide: For X11 R3 and R4 of the X Window System ([3rd ed.].). O' Reilly and Associates, Inc.

Chicago Style (17th ed.) Citation

O'Reilly, Tim, and Valerie Quercia. X Window System User's Guide: For X11 R3 and R4 of the X Window System. [3rd ed.]. Sebastopol CA: O' Reilly and Associates, Inc, 1990.

MLA (8th ed.) Citation

O'Reilly, Tim, and Valerie Quercia. X Window System User's Guide: For X11 R3 and R4 of the X Window System. [3rd ed.]. O' Reilly and Associates, Inc, 1990.