Hair:
http://cornerstone.lib.mnsu.edu/cgi/viewcontent.cgi?article=1003&context=jur
http://scholarworks.gsu.edu/cgi/viewcontent.cgi?article=1095&context=art_design_theses
http://file.scirp.org/pdf/JSS_2014010814473478.pdf
http://www.aaregistry.org/historic_events/view/black-hair-care-and-culture-story
http://www.ijessnet.com/wp-content/uploads/2014/11/10.pdf