¹Jennifer Mary Marsh; John Gray; Antonella Tosti (18 August 2015), Healthy Hair, Springer, pp. 6-8,48-50.
²Ed.Trefor Evans and R. Randall Wickett (2012), Practical Modern Hair Science, Allured Books, pp.148-152
³Swift, J. A. (1999). The mechanics of fracture of human hair. International journal of cosmetic science, 21(4), 227-239
⁴Practical Modern Hair Science Trefor Evans and R.Randall Wickett pgs 373-375
⁵Nanko, H., Mutoh, Y., Atsumi, R., Kobayashi, Y., Ikeda, M., Yoshikawa, N., Fukuda, S., Kawa, Y., & Mizoguchi, M. (2000). Hair Discoloration of Japanese Elite Swimmers. The Journal of Dermatology, 27(10), 625-634