APA (7th ed.) Citation

(1991). The X resource: A practical journal of the X window system. O'Reilly & Associates.

Chicago Style (17th ed.) Citation

The X Resource: A Practical Journal of the X Window System. Sebastapol, CA: O'Reilly & Associates, 1991.

MLA (9th ed.) Citation

The X Resource: A Practical Journal of the X Window System. O'Reilly & Associates, 1991.