Jeffrey Ressner and James Collins (March 23, 1998). "Gross And Grosser". Time. Archived from the original on August 21, 2009. Retrieved April 28, 2009.
treyparker.info
"40 Questions". South Park Studios. October 4, 2001. Archived from the original on November 29, 2010. Retrieved January 30, 2009.
Jeffrey Ressner and James Collins (March 23, 1998). "Gross And Grosser". Time. Archived from the original on August 21, 2009. Retrieved April 28, 2009.