Me pēnei te tohu i te whārangi:

W. A. Laxon. Related biographies for 'Niccol, George Turnbull', Dictionary of New Zealand Biography, first published in 1996. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/3n8/niccol-george-turnbull/related-biographies (accessed 13 May 2024)