"Halfpipe". Six Flags America. Archived from the original on February 14, 2017. Retrieved February 13, 2017.
skateboarding.com
Skin Phillips (January 10, 2013). "30TH ANNIVERSARY INTERVIEWS: JOHN CARDIEL"(Video upload). Transworld Skateboarding. Bonnier Corporation. Archived from the original on January 13, 2013. Retrieved January 14, 2013.
Black Label Skateboards (January 2009). "WhoCares The Duane Peters Story Trailer"(Video upload). Black Label Skateboards on Vimeo. Vimeo LLC. Retrieved January 18, 2013.
"Halfpipe". Six Flags America. Archived from the original on February 14, 2017. Retrieved February 13, 2017.
Skin Phillips (January 10, 2013). "30TH ANNIVERSARY INTERVIEWS: JOHN CARDIEL"(Video upload). Transworld Skateboarding. Bonnier Corporation. Archived from the original on January 13, 2013. Retrieved January 14, 2013.