Me pēnei te tohu i te whārangi:
Alan Sherwood and Jock Phillips, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/coal-and-coal-mining/media (accessed 2 December 2023)
He kōrero nā Alan Sherwood and Jock Phillips, i tāngia i te 12 Jun 2006, reviewed & revised 14 Apr 2021