Delmar Smith would actually be a dog trainer by profession.................... Richard Wolters was a literary writer.......................... take your own opinion on what would be more usefull, Paul Long was a dog trainer long before the invent of anything electronic in dog training,as bluemoon suggests a good book, Robert Wehle a marketeer of Elhew pointers has a book that is very informational called "Wing and Shot",his training buddy was a guy named Earl Crangle and he has a book as well. Buy wolters book to keep you warm by the fire as you peruse the pages of the others IMO.