Really beginners book to VHDL, only covers the basic syntax, doesn't cover packages, testbenches, records, etc. I would say it's the perfect book if one never worked in HDL and wants a step by step guide on why describing hardware is not programming, how you should think in a concurrent way when designing and wants tons of exercises (with solutions, but no simulation or even a "how to" guide to simulate designs with open source tools such as ghdl).
After that I would highly recommend Circuit Design and Simulation with VHDL by V. Pedroni. To this day, it is still my go to reference. After that, look into VHDL 2008: Just the new stuff to write powerful testbenches.