APA Citation

 Shelly, G. B. (2010).  HTML, XHTML, and CSS: Comprehensive.  Course Technology.

Chicago Style Citation

 Shelly, Gary B.  HTML, XHTML, and CSS: Comprehensive.  Course Technology, 2010.

MLA Citation

 Shelly, Gary B.  HTML, XHTML, and CSS: Comprehensive.  Course Technology, 2010.

Warning: These citations may not always be 100% accurate.