1. Council of Europe. Resolution Res Ap (2008)1 on requirements and criteria for the safety of tattoos and permanent make-up (adopted by the Committee of Ministers on 20 February 2008).
2. P. Piccinini, S. Pakalin, L. Contor, I. Bianchi, C. Senaldi, Safety of tattoos and permanent make-up. Final report; EUR 27947 EN (European Commission, 2016). 〈https://doi.org/10.2788/011817〉.
3. A medical-toxicological view of tattooing;Laux;Lancet,2016
4. Cosmetic lip tattoo sequelae: a case report and review of literature;AlQuorain;J. Dermatol. Dermatol. Surg.,2017
5. U.S. Food and Drug Administration, A Tattoo for You? Seven Key Questions to Consider. 〈https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm316357.htm〉.