• Analysis and Design of Digital Systems with VHDL, Allen Dewey, PWS Publishing Company, 1997. - This book combines digital design and VHDL. The VHDL is in chapters 11-19, and there is a list of VHDL keywords in Appendix B on page 664.
• VHDL, Douglas L. Perry, Second Edition, McGraw Hill, 1993. - Last year's text, chosen for it's good description of the semantics of VHDL, but students complained they could not find things in it.
• A VHDL Primer, Jayaram Bhasker, Prentice Hall, 1992. This is a good book to use if you just want to check on syntax issues. Appendix B is a complete syntax reference.
• The Designer's Guide to VHDL by Peter J. Ashenden, Morgan Kaufmann Publishers, 1995 This is the book I use, so you might as well use it too. It is very complete and has good examples.

 Next to the printer you will find copies of the "VHDL Language Reference Card". Some are folded, some are not. This is a double-sided, one-sheet guide to VHDL syntax. It is obviously incomplete, but might be handy for quickly looking up reserved words, types, operators and other syntax. 

Altera Help

Model Tech PDF files

Netscape

• VHDL Glossery
• The VHDL FAQ (Frequently Asked Questins) From the comp.lang.vhdl newsgroup
• Other VHDL stuff
• Hamburg VHDL Archive
• An on-line introduction