Me pēnei te tohu i te whārangi:
Ben Schrader, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/extreme-sports-and-adventure-sports/media (accessed 1 April 2023)
He kōrero nā Ben Schrader, i tāngia i te 5 Sep 2013