Swami, V., Tran, U. S., Kuhlmann, T., Stieger, S., Gaughan, H., & Voracek, M. (2016).  More similar than different: Tattooed adults are only slightly more impulsive and willing to take risks than Non-tattooed adults. Personality and Individual Differences, 88, 40-44. DOI: 10.1016/j.paid.2015.08.054