Breaking and Training the Driving Horse: A Detailed and Comprehensive Study by Doris Ganton

If you are simply riding your horse, you are only using part of his ability. When a horse is trained to drive, his usefulness- and your enjoyment - are both greatly increased. 

In her classic book, Breaking and Training the Driving Horse, Doris Ganton shares in detail her highly successful, step-by-step method of learning how to drive your horse. Many horse enthusiasts recommend it as a go-to reference, including Prince Phillip, the Duke of Edinburgh.