Me pēnei te tohu i te whārangi:

Allan K. Davidson. Related biographies for 'Ryburn, Hubert James', Dictionary of New Zealand Biography, first published in 2000. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/5r33/ryburn-hubert-james/related-biographies (accessed 19 April 2024)