Online Resources:

• World Wide Web Consortium:
• W3 Style Sheets
• CSS 1 Specification
• CSS 2 Specification
• CSS 3 Under Construction
• W3C CSS Validator
• Master Compatibility Grid
• Web Site Tips: CSS
• Web Review Style Sheet Reference Guide
• Builder CSS Reference Table
• Webmonkey Style Sheet Guide
• Mulder's Stylesheets Tutorial
• HTML Goodies CSS Tutorials
• A List Apart: Past Issues: CSS
• NYPL Style Guide
• CSS Zen Garden
• CSShark Answers FAQs
• Glish: CSS Layout Techniques
• Index Dot CSS
• Real World Style
• CSS Sketchbook
• House of Style
• Web Developer CSS Links
• HTML Source: Style Guide
• CSS FAQs

Textbooks:

• McFarland, David S. CSS:The Missing Manual, 1st ed. USA: O'Reilly
• Meyer, Eric. Cascading Style Sheets: The Definitive Guide, 1st ed. Sebastopol: O'Reilly, 2000
• Lie, Hakon Wium and Bert Bos. Cascading Style Sheets: Designing for the Web, 2nd ed. Harlow, England: Addison-Wesley, 1999
• Briggs, Owen and Steven Champeon, Eric Costello, Matt Patterson. Cascading Style Sheets: Separating Content from Presentation, 1st ed. Birmingham, England: Glasshaus, 2002