Me pēnei te tohu i te whārangi:
Margaret Richardson, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/forestry-research/media (accessed 26 May 2022)
He kōrero nā Margaret Richardson, i tāngia i te 24 Nov 2008