Articles describing or mentioning The X Window System:
“OSF/Motif” by John Paul, from Byte 1989A first look at OSF/Motif
“A guide to GUIs” by Frank Hayes and Nick Baran, from Byte 1989A 1989’s look at and comparison of twelve then-state-of-the-art graphical user interfaces
“The X attitude” by Marshall Brain, from Byte 1991Pros and cons of The X Window System