These are the following books we would like to highly recommend you to learn Verilog HDL.
- Digital Design and Verilog HDL Fundamentals
- Advanced Digital Design with the Verilog HDL
- Digital Design with RTL Design, VHDL, and Verilog
- The Verilog Hardware Description Language
- Verilog Hdl: A Guide to Digital Design and Synthesis
- A Verilog HDL Primer – by J. Bhasker
- Digital Design: With an Introduction to the Verilog HDL, VHDL and System Verilog