Me pēnei te tohu i te whārangi:
Brian Easton, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/economic-history/media (accessed 11 December 2023)
He kōrero nā Brian Easton, i tāngia i te 11 Mar 2010