Me pēnei te tohu i te whārangi:

K. A. Simpson. Related biographies for 'Grabham, George Wallington', Dictionary of New Zealand Biography, first published in 1993, updated o Māehe, 2006. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/2g14/grabham-george-wallington/related-biographies (accessed 9 May 2024)