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X Window System - Wikipedia
X.Org
The X New Developer’s Guide: X Window System Concepts
What Is X11? | Baeldung on Linux
The GUI You Never Knew You Had: The X-Window System - Make Tech Easier
X Window System protocols and architecture - Wikipedia
An introduction to X by The Linux Information Project (LINFO)
Documentation for the X Window System
An Introduction to the X Window System - Princeton University
An Introduction to the X Window System - O'Reilly Media