(EN) Javier C. Angulo, García-Díez Marcos e Marc Martínez, Phallic Decoration in Paleolithic Art: Genital Scarification, Piercing and Tattoos (abstract), in The Journal of Urology, American Urological Association Education and Research, Inc., dicembre 2011, DOI:10.1016/j.juro.2011.07.077.
bjmp.org
(EN) Thomas Neluis, Myrna L. Armstrong, Cathy Young, Alden E. Roberts, LaMicha Hogan e Katherine Rinard, Prevalence and implications of genital tattoos: A site not forgotten (abstract), in British Journal of Medical Practitioners, vol. 7, n. 4, dicembre 2014.
(EN) Javier C. Angulo, García-Díez Marcos e Marc Martínez, Phallic Decoration in Paleolithic Art: Genital Scarification, Piercing and Tattoos (abstract), in The Journal of Urology, American Urological Association Education and Research, Inc., dicembre 2011, DOI:10.1016/j.juro.2011.07.077.
(EN) Jen, The road to completion is long..., su ModBlog, BME News/Body Modification Ezine, 4 dicembre 2012 (archiviato dall'url originale il 3 dicembre 2017).