1. Vogt A, McElwee K, Blume-Peytavi U. Biology of the hair follicle. In: Blume-Peytavi U, Tosti A, Trüeb R, editors. Hair growth and disorders. Berlin: Springer; 2008.
2. Derham W. Chapter XII, of animals clothing. In: Physico-theology: Or, a demonstration of the being and attributes of god, from his works of creation. London: W. Innys; 1713.
3. Ephraim C. Cyclopaedia; or an Universal Dictionary of Arts and Sciences. Vol 2. 2nd ed. London: J. and J. Knapton, J. Darby, D. Midwinter et al., 1728–1738.
4. Von Koelliker RA. Handbuch der Gewebelehre des Menschen. Leipzig: Engelmann; 1852.
5. Nagorcka BN, Mooney JR. The role of a reaction—diffusion system in the formation of hair fibres. J Theor Biol. 1982;98(4):575–607.