Me pēnei te tohu i te whārangi:
Adolf Stroombergen, 'Ngā whakaahua, ngā rauemi katoa', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/prices-and-inflation/media (accessed 29 March 2024)
He kōrero nā Adolf Stroombergen, i tāngia i te 11 Mar 2010