Sources:
1. http://www.helium.com/items/625002-how-tattoos-affect-skin-cells
2. http://dermatology.about.com/cs/skinanatomy/a/anatomy.htm
3. DeMallo, M. (2007). Encyclpedia of body adornment. Westport, CT: Greenwood
Press.
4. http://www.statisticbrain.com/tattoo-statistics/
5. https://www.msu.edu/~krcmari1/individual/get_process.html
