1. Aoki K (2004) Avoidance and prohibition of brother–sister sex in humans. Population Ecology 47: 13–19. Available:http://www.springerlink.com/index/10.1007/s10144-004-0199-3. Accessed 27 August 2011.
2. The intensity of human inbreeding;AH Bittles;Behavioral and brain sciences,1983
3. May R (1979) When to be incestuous. Nature 279: 192–194. Available:http://adsabs.harvard.edu/abs/1979Natur.279.192M. Accessed 2 December 2011.
4. Pathogens, polymorphism, and the evolution of sex;J Tooby;Journal of Theoretical Biology,1982
5. Bittles AH, Neel JV (1994) The costs of human inbreeding and their implications for variations at the DNA level. Nature Genetics 8: 117–121. Available:http://www.nature.com/naturegenetics. Accessed 30 October 2012.