The several volumes of Golf Architecture edited Paul Daley are excellent. Each volume contains short essays by very knowledgeable contributors, often beautifully illustrated, on all sorts of aspects of the subject from the very specific to the general. Wonderful browsing when you have a few spare minutes.
The Life and Works of Dr Alister MacKenzie by Doak/Scott/Haddock is a must read, especially given MacK's worldwide influence.
Golf's Magnificent Challenge by Robert Trent Jones is worth a read. He's not greatly loved on GCA but, for better or for worse, he did influence the course of GCA in many countries over a long period. RTJ was not reticent in singing his own praises - neither was MacKenzie for that matter. But many of the stories he has to tell and the insight he gives into his philosophy should not be overlooked.
Nicklaus, RTJ 2, Fazio have also written architecture books. Even if their designs are not necessarily to our taste we should read them before condemning. There's plenty to think about.
It's worth getting a copy of The Architects of Golf (Cornish and Whitten) if only to have their huge lists of courses and designers that form the appendix. The lists are not without errors, but nothing else comes close to such a knowledge bank.
Darwin and Rowntree's Golf Courses of the British Isles is beautifully written, but there's not much about architecture as such, and most of the courses have been significantly changed since publication. It's available inexpensively in facsimile.
Hoylake - A history of the Links by Anthony Shone gives a comprehensive account of the development of the course over nearly a century and a half.
Classic Golf Links of Great Britain and Ireland by Donald Steel is very informative, particularly as Donald was not only a fine player and classy golf writer but also himself an architect of note. It is 20 years old, but little has changed since it was first published.
British Golf Links by Horace Hutchinson is a classic, published in 1897. Daniel Wexler produced a facsimile edition a few years ago and added a very interesting afterword, telling us what has happened to these courses and clubs in the years since then. It is not cheap, but it ought to be on the library shelves of anyone interested in the subject.
The definitive guide to the Hotchkin Course, Woodhall Spa by Richard Latham is an extraordinary account of the development of the course over a century with a blow-by-blow account of the placing of pretty well every single bunker. Eric Hepworth's photographs are stupendous, the graphics terrific. Unfortunately the text needs a good editor, but the book is a feast for the eyes.