The Horse and the Bit by Susan McBane
Drawing together the detailed knowledge and opinions of 18 experts, this book explains the complexities of bits and bitting. It covers the manufacture of bits, the importance of hand sensitivity and a secure independent seat in the rider, and the advantages and disavantages of snaffles, gags, double gridles, martingales, Pelhams and curbs. The book is aimed at serious sporting and competitive riders and career students.