Me pēnei te tohu i te whārangi:
Keith Lewis, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/engineering-on-the-sea-floor/media (accessed 23 September 2023)
He kōrero nā Keith Lewis, i tāngia i te 12 Jun 2006