Me pēnei te tohu i te whārangi:
Roger Young, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/life-in-fresh-water/media (accessed 26 June 2024)
He kōrero nā Roger Young, i tāngia i te 24 Sep 2007