1. ^[https://peru.com/futbol/internacional/roberto-carlos-fue-acusado-dopaje-y-asi-se-defendio-noticia-518157 Roberto Carlos fue acusado de dopaje y así se defendió], peru.com, June 12, 2017 (in Spanish)
2. ^[https://web.archive.org/web/20170613190013/http://www.sportschau.de/doping/video-doping-top-secret---brazils-dirty-game-100.html Doping Top Secret - Brazil´s Dirty Game], 10.06.2017, ARD
3. ^[https://programm.ard.de/?sendung=28106790459091 Geheimsache Doping: Brasiliens zwölfter Mann], ARD, July 1, 2018 (in German)
4. ^[https://www.sportschau.de/doping/doping-fussball-brasilien-100.html Geheimsache Doping - Profifußballer besuchen dubiosen brasilianischen Mediziner], Hajo Seppelt, Florian Riesewieck, Edmund Willison, and Sebastian Münster, ARD, July 1, 2018 (in German)
5. ^[https://www.thesun.co.uk/sport/football/3773787/roberto-carlos-denies-doping-allegations/ Roberto Carlos denies doping allegations as German documentary claims Brazil and Real Madrid ace used performance enhancing drugs], Alex Terrell, The Sun, 11th June 2017
6. ^[https://www.vocativ.com/news/437815/documentary-brazilian-soccer-doping-crisis/index.html Documentary Alleges Major Doping Crisis In Brazilian Soccer], Joe Lemire, vocativ, Jun 12, 2017
7. ^[https://web.archive.org/web/20171020192504/http://www.sportschau.de/doping/geheimsache-doping-englisch-100.html DOPING: TOP SECRET - Brazil’s Dirty Game], Hajo Seppelt, Florian Riesewieck, and Thilo Neumann, ARD, June 10, 2017, archived