Boyle, A. "The Everyman Encyclopædia - Volume 12". J.M. Dent & sons Limited - 2008. Retrieved 1 August 2017. At first the wrestlers wore tight-fitting shorts - a girdle - but in later times they wrestled naked...
"Article 7 - Age, Weight and Competition Categories"(PDF). International Wrestling Rules: Greco-Roman Wrestling, Freestyle Wrestling, Female Wrestling. United World Wrestling (then FILA). July 2014. p. 8. Retrieved 2015-09-30.
"Article 7 - Age, Weight and Competition Categories"(PDF). International Wrestling Rules: Greco-Roman Wrestling, Freestyle Wrestling, Female Wrestling. United World Wrestling (then FILA). July 2014. pp. 9–10. Retrieved 2015-09-30.
"Article 7 - Age, Weight and Competition Categories"(PDF). International Wrestling Rules: Greco-Roman Wrestling, Freestyle Wrestling, Female Wrestling. United World Wrestling (then FILA). July 2014. p. 10. Retrieved 2015-09-30.