My multiple-reads include the usual suspects:
The Anatomy of a Golf Course by Tom Doak (this has been my most useful book for researching the construction of a golf course)
Grounds for Golf by Geoff Shackelford (an enjoyable book with a lot more historical and classic course information)
Scotland's Gift by C.B. Macdonald (also fun and interesting but sometimes covers information that I don't really care about to the exclusion of information I'd have an interest in)
One unlikely book I've returned to, that I wouldn't necessarily recommend, is Golf By Design by Robert Trent Jones Jr. I go back to it because it provides a number of good images/sketches to illustrate the concepts in it. In fact, even if the concept doesn't seem terribly well explained, sometimes the image tells the story all on its own.
Now, not all of the images are great, and the photographs often seem to have been chosen more with an eye to making sure a diverse array of the author's courses were included than with the intent of finding the best example of a given concept.
Also, one must note that this book is not meant to be like the others; no real discussion of design (which to me is the process of accumulating a vocabulary and then making choices) is undertaken. And somewhat tangential, whenever the author discussed his contemporaries' work he often seemed to be damning with faint praise. One unqualified compliment he made was about Tom Doak, though it was quite short:
"Good examples of a Redan Hole:
Tom Doak, High Pointe Golf Club"
At $3.99 I couldn't pass it up.