X and Motif Quick Reference Guide
XENIX System V Command Summary
XML Pocket Reference: Covers XSLT 2nd Ed.
X Window Applications Programming
X Windows Systems: Programming and Applications with Xt
X Window System: C Library and Protocol Reference
You and Your Customer: The Capable Manager — Book 10
You're In Charge — Now What?: The 8 Point Plan
Your First 100 Days In a New Executive Job: Powerful First Steps on the Path to Greatness
Your MBA with Distinction: Developing a systematic approach to succeeding in your business degree
Zero to One: Notes on Startups, or How To Build he Future