1. Berg C (1951) The unconscious significance of hair. G. Allen and Unwin.
2. http://www.latimes.com/features/image/la-ig-mens-hairstyle-timeline-photos,0,7486612.photogallery
3. http://en.wikipedia.org/wiki/Hair_(musical)
4. http://en.wikipedia.org/wiki/Hairstyle
5. http://en.wikipedia.org/wiki/Long_hair