http://humanorigins.si.edu/evidence/genetics/skin-color

Genetics in the 21st Century: http://www.nabt.org/websites/institution/File/pdfs/american_biology_teacher/2010/AprilABTOn.pdf

Desiree's Baby: http://www.sciencecases.org/skin_color/skin_color_notes.asp

Kate Chopin: DESIREE'S BABY online: http://www.gutenberg.org/dirs/1/6/160/160.txt