Graeme Dunstall. 'Cummings, Denis Joseph rāua ko Cummings, James', Ngā Tāngata Taumata Rau, i tāngia tuatahitia ki 1998. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/126511/related-biographies (accessed 4 June 2026).