- XML and InDesign By Dorothy J. Hoskins from O'Reilly Media
- XXL-Pfarrei By Andreas Unfried from Echter
- x-Gleichnungen By Adolf Hauschka from Hauschka Verlag
- XML in a Nutshell By from O'Reilly Verlag
- XEN Kochbuch By Hans Joachim Picht from O'Reilly Verlag
- XSLT Kochbuch By Sal Mangano from O'Reilly Verlag
- XNA 4.0 Game Development by Example By Kurt Jaegers from Packt Publishing
- XAML Developer Reference By Mamta Dalal; Ashish Ghoda from Microsoft Press
- XSL-FO: Vollständige Referenz By XML Schule from Welsch, Ursula
- Xcode 4 iOS Development Beginner's Guide By Steven F. Daniel from Packt Publishing
- XML Schema By Eric van der Vlist from O'Reilly Media
- XML Pocket Consultant By William R. Stanek from Microsoft Press
- XML Publishing with InDesign CS2+ By Dorothy Hoskins from O'Reilly Media
- XNA 4.0 Game Development by Example: Beginner's Guide By Kurt Jaegers from Packt Publishing
- Xen 3.2 By Andrej Radonic; Frank Meyer; Thomas Halinka from Franzis
- XML Standards By Tobias Hauser from entwickler pressentwickler press
- XML Publishing with Adobe InDesign By Dorothy J. Hoskins from O'Reilly Media
- XML Hacks By Michael Fitzgerald from O'Reilly Media
- XMPP: The Definitive Guide By Peter Saint Andre; Kevin Smith; Remko Tronçon from O'Reilly Media
- XAML in a Nutshell By Lori A. MacVittie from O'Reilly Media
- X Power Tools By Chris Tyler from O'Reilly Media
- XSLT Cookbook By Sal Mangano from O'Reilly Media
- XML in a Nutshell By Elliotte Rusty Harold; W. Scott Means from O'Reilly Media
- XSL-FO By Dave Pawson from O'Reilly Media
- XPath and XPointer By John Simpson from O'Reilly Media
- XQuery By Priscilla Walmsley from O'Reilly Media
- XSLT By Doug Tidwell from O'Reilly Media
- XML Pocket Reference By Michael Fitzgerald; Simon St. Laurent from O'Reilly Media
- XSLT 1.0 Pocket Reference By Evan Lenz from O'Reilly Media

