1. Animal Fiber—Wikipedia, the Free Encyclopediahttp://en.wikipedia.org/wiki/Animal_fiber
2. The Coloration of Wool and other Keratin Fibres;Lewis,2013
3. Mechanical Properties and Structure of Alpha-Keratin Fibres: Wool, Human Hair and Related Fibres;Feughelman,1997
4. Natural Fibers, Plastics and Composites;Wallenberger,2004
5. Structure and biochemistry of mammalian hard keratin