1. 1986 Cunningham's Manual of Practical Anatomy, Vol. 3, 15th ed. Oxford: Oxford University Press, pp. 50-51.
2. 1991 Grant's Dissector. 10th ed. Baltimore: Williams and Wilkins, pp. 143-144.
3. and 1989 (eds) Gray's Anatomy, 37th ed. Edinburgh: Churchill Livingstone, p. 703.