Tom Morris the Colossus of Golf is a pretty amazing golf book, but not neccessarily an architecture book.
Scotland's Gift has some unbelievably great architecture sections, but isn't soley devoted to architecture.
Golf Architecture in America (Thomas), Golf Architecture (Mackenzie), and The Links (Hunter) are invaluable architecture books. IMO.
Rough Meditations is a good overview of golf and architecture.
The World Atlas of Golf, Planet Golf, Planet Golf USA, and The Confidential Guide are fun books to read and look over.