Me pēnei te tohu i te whārangi:

Pat Palmer. Related biographies for 'Hilgendorf, Frederick William', Dictionary of New Zealand Biography, first published in 1996. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/3h25/hilgendorf-frederick-william/related-biographies (accessed 10 June 2023)