1. Brundage M. XQuery: The XML Query Language. Pearson Higher Education, Addison-Wesley, Reading, MA, USA, 2004.
2. Chamberlin D.D., Robie J., and Florescu D. Quilt: An XML query language for heterogeneous data sources. In Proc. 3rd Int. Workshop on the World Wide Web and Databases, 2000, pp. 53–62.
3. Hidders J., Paredaens J., Vercammen R., and Demeyer S. A light but formal introduction to XQuery. In Database and XML Technologies, 2nd Int. XML Database Symp., 2004, pp. 5–20.Toronto, Canada.
4. Katz H., Chamberlin D., Kay M., Wadler P., and Draper D. XQuery from the experts: A guide to the W3C XML query language. Addison-Wesley Longman, Boston, MA, USA, 2003.
5. Melton J. and Buxton S. Querying XML: XQuery, XPath, and SQL/XML in context. Morgan Kaufmann, San Francisco, CA, USA, 2006.