[Discover] W3C QA - Recommended list of DTDs you can use in your Web document. http://www.w3.org/QA/2002/04/valid-dtd-list.html (xhtml dtd doctype html)
 [Discover] A List Apart: Articles: Fix Your Site With the Right DOCTYPE! http://www.alistapart.com/stories/doctype/ (doctype xhtml css reference)
 [Discover] How to achieve Web standards and quality on your Web site http://www.w3.org/QA/2002/04/Web-Quality (doctype dtd webstandards accessibility)
 [Discover] Activating the Right Layout Mode Using the Doctype Declaration http://hsivonen.iki.fi/doctype/ (doctype xhtml reference browser)
 [Discover] A List Apart: Articles: Fix Your Site With the Right DOCTYPE! http://www.alistapart.com/articles/doctype/ (doctype xhtml css webdev)
 [Discover] Juicy Studio: Choosing a DOCTYPE http://juicystudio.com/article/choosing-doctype.php (css doctype xhtml html)
 [Discover] Doctype Switching http://www.webdevout.net/doctype-switching (doctype xhtml css html)
 [Discover] How to Read an XHTML Doctype Declaration http://www.uninetnews.com/xhtml/doctype.php (doctype xhtml)
 [Discover] Listamatic: The IE box model and Doctype modes http://css.maxdesign.com.au/listamatic/about-boxmodel.htm (css boxmodel browser ie)
 [Discover] Eric Meyer on CSS: Picking a Rendering Mode http://www.ericmeyeroncss.com/bonus/render-mode.html (css design doctype xhtml)
 [Discover] W3C I18N Tutorial: Character sets & encodings in XHTML, HTML and CSS http://www.w3.org/International/tutorials/tutorial-char-enc/ (xhtml encoding html charset)