Me pēnei te tohu i te whārangi:
Peter Clayworth, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/sports-medicine-and-drugs/media (accessed 29 May 2023)
He kōrero nā Peter Clayworth, i tāngia i te 5 Sep 2013