Spirit of St.Andrews-MacKenzieArchitectural Side-Wethered/SimpsonThe Links-HunterGolf Architecture-ThomasAnatomy of Golf-Doak,Architects of Golf-Whitten and Golden Age-Shackelford(tie)Those are just pure architecture, if it were open to related topics World Atlas, Confidential Guide and Encyclopedia of Golf would likely nudge out some of those above and that doesn't even consider essayists like Darwin, Wind, Ward-Thomas, Longhurst, Dickinson, Klein, McKinlay ....There really is a wealth of golf literature.