- http://www.buddhistchannel.tv/index.php?id=57,8938,0,0,1,0#.VkknP8rPYWE
- http://expertvagabond.com/sak-yant-tattoo/
- http://sak-yant.com/
- https://cardinalguzman.wordpress.com/2013/03/31/the-history-of-tattoo-part-3-the-indians/
- http://www.polynesia.com/polynesian_culture/samoa/samoan-tattoos.html#.Vk6Yj8rPYWE
- http://www.pbs.org/skinstories/history/
- http://www.eeoc.gov/eeoc/newsroom/release/9-16-05.cfm
- http://www.statisticbrain.com/tattoo-statistics/
- http://www.forbes.com/sites/rachelhennessey/2013/02/27/having-a-tattoo-and-a-job/
- http://www.usatoday.com/story/news/nation/2014/09/11/tattoo-taboo-workplace/15449719/
- http://www.armytimes.com/story/military/careers/army/2015/04/10/army-regs-tattoos-uniforms/25576197/
- http://www.p-ink,org
- https://www.youtube.com/watch?t=7&v=MYn15yDBvxM
- http://www.amsciepub.com/doi/pdf/10.2466/pr0.2001.89.3.774
- http://www.jstor.org/stable/20715974
- http://www.jstor.org/stable/606008
- http://www.jstor.org/stable/25486348