Hoepers, C., Barbosa, H. F., Steding-Jessen, K., & CGI.br. (2017). Fighting Internet spam in Brazil - Historical overview and reflections on combating spam and managing port 25, coordinated by the Brazilian Internet Steering Committee. Comitê Gestor da Internet no Brasil.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHoepers, Cristine, Henrique Faulhaber Barbosa, Klaus Steding-Jessen, और CGI.br. Fighting Internet Spam in Brazil - Historical Overview and Reflections on Combating Spam and Managing Port 25, Coordinated by the Brazilian Internet Steering Committee. Comitê Gestor da Internet no Brasil, 2017.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHoepers, Cristine, et al. Fighting Internet Spam in Brazil - Historical Overview and Reflections on Combating Spam and Managing Port 25, Coordinated by the Brazilian Internet Steering Committee. Comitê Gestor da Internet no Brasil, 2017.