1. Verilog Language Reference Manual copyright 1991 by OVI. 296 pages of language definition and reference. Quite technical, a complete reference, but superseded by the 1995 IEEE Verilog standard.
2. Verilog Tutorial In-depth tutorial by Deepak Kumar Tala
3. Verilog Tutorial from University of Evansville
4. http://www.ee.ed.ac.uk/~gerard/Teach/Verilog/index.html An intro to digital design and Verilog
5. http://www.asic-world.com/verilog/index.html Tutorial, examples, tools, books, links and a comprehensive FAQ
6. http://bawankule.com/verilogfaq/ Lots of info here: FAQs, resources, examples and links
7. http://www.eg.bucknell.edu/~cs320/fall-1997/verilog.html A link to Verilog resources at Bucknell University
8. http://dmoz.org/Science/Technology/Electronics/Design/Hardware_Description_Languages/Verilog/ A dmoz search, with many usable links
9. Verilog examples from CS223 in previous years & previous textbooks: 2010, 2011 and other. LCDF Chapter 4, LCDF Chapter 5. Behavioral-style Verilog
10. VHDL & Verilog Compared and Contrasted a paper from a neutral viewpoint assessing both languages