Me pēnei te tohu i te whārangi:

Simon Rae. Related biographies for 'Campbell, William Rickarby', Dictionary of New Zealand Biography, first published in 1993. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/2c5/campbell-william-rickarby/related-biographies (accessed 30 May 2024)