I'll add three to the generally excellent list being compiled...
Lines of Charm, by Geoff Shackelford: A great collection of quotes from architects through the ages.
Routing the Golf Course, by Forrest Richardson: A nuts and bolts look at laying out and building a course.
Bunkers, Pits and Other Hazards, by Forrest Richardson and Mark Fine: A comprehensive look at hazards and their role in architecture. Very, very good.
I don't think I saw The Links, by Robert Hunter, mentioned, either. Bill Coore refers to it as the Bible of GCA. Pretty good recommendation.