I read this book for my Open university course and found it very hard going. Not just because the subject matter was difficult and new to me, but simply because of the way the author writes. Never use ten simple words if thirty hard ones will do; have subheadings with little to do with what is under them; tell us that it is important to distinguish between x and y and then don't explain the difference clearly.
Even my tutor admitted this book was hard going!