1Anon. (2009). Rules for Dressage Events. Lausanne: Fédération Équestre Internationale.
2Cook, WR (1999). Pathophysiology of bit control. Journal of Equine Veterinary Science 19: 196–204.
3Tell, A, Egenvall, A, Torbjörn, L and Wattle, O (2008). The prevalence of oral ulceration in Swedish horses when ridden with bit and bridle and when unridden. Veterinary Journal 178: 405–410.
4Johnson, TJ (2002). Surgical removal of mandibular periostitis (bone spurs) caused by bit damage. Proceedings of the American Association of Equine Practitioners 48: 458–462.
5Clayton, HM and Lee, RL (1984). A fluoroscopic study of the position and action of the jointed snaffle bit in the horse's mouth. Journal of Equine Veterinary Science 4: 193–196.
6Clayton, HM (1985). A fluoroscopic study of the position and action of different bits in the horse's mouth. Journal of Equine Veterinary Science 5: 68–77.
7Manfredi, J, Clayton, HM and Rosenstein, D (2005). Radiographic study of bit position within the horse's oral cavity. Equine and Comparative Exercise Physiology 2: 195–201.
8Knox-Thompson, E and Dickens, S (1990). Pony Club Manual No. 2. Auckland, NZ: Ray Richards.
9Clayton, HM, Singleton, WH, Lanovaz, JL and Cloud, GL (2003). Measurement of rein tension during horseback riding using strain gage transducers. Experimental Techniques 27: 34–36.
10Huynh, H and Mandeville, GK (1979). Validity conditions in repeated measures designs. Psychological Bulletin 86: 964–973.
11Kapitzke, G (2004). The Bit and the Reins. Munich: Trafalgar Square Publishing.
12Manfredi, J, Clayton, HM and Derksen, F (2005). Swallowing frequency in cantering horses: effects of different bits and bridles. Equine and Comparative Exercise Physiology 2: 241–244.
13Myler, D, Myler, R and Myler, B (2000). A Whole Bit Better. Oswego, OR: Toklat Originals.
14Clayton, HM, Singleton, WH, Lanovaz, JL and Cloud, GL (2005). Strain gauge measurement of rein tension during riding: a pilot study. Equine and Comparative Exercise Physiology 2: 203–205.
15Preuschoft, H, Witte, H, Recknagel, S, Bar, H, Lesch, C and Wuthrich, M (1999). The effects of various head-gears on horses. Deutsche tierarztliche Wochenschrift 106: 169–175.
16Singleton, WH (2001). .
17Engelke, E and Gasse, H (2003). An anatomical study of the rostral part of the equine oral cavity with respect to position and size of a snaffle bit. Equine Veterinary Education 15: 200–205.
18Dyce, KM, Sack, WO and Wensing, CJG (2002). Textbook of Veterinary Anatomy. 3rd edn.Philadelphia, PA: W.B. Saunders Company.
19van Lancker, S, van den Broek, W and Simoens, P (2007). Incidence and morphology of bone irregularities of the equine interdental spaces (bars of the mouth). Equine Veterinary Education 19: 103–106.
20Anthony, D and Brown, D (1991). The origins of horseback riding. Antiquity 65: 22–28.