Me pēnei te tohu i te whārangi:
Carl Walrond, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/building-and-construction-industry/media (accessed 21 April 2024)
He kōrero nā Carl Walrond, i tāngia i te 11 Mar 2010