Me pēnei te tohu i te whārangi:
Nigel S. Roberts, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/electoral-systems/media (accessed 19 March 2024)
He kōrero nā Nigel S. Roberts, i tāngia i te 20 Jun 2012, updated 1 Feb 2015