X Window System Users Guide ( - ACCEPTABLE

X Windows System Administrators Guide, Vol 8 (Definitive Guides to the X - GOOD

X Window System User's Guide, OSF/Motif Edition by Valerie Quercia & Tim O’Reill

XLIB Reference Manual R5: The Definitive Guides to the X Window System

Xlib Reference Manual R5: The Definitive Guides to the X Window System

Volume 6B: Motif Reference Manual (Definitive Guides to the X Window System)

X Toolkit Intrinsics Ref Man R5: The Definitive Guides to the X Window System