Me pēnei te tohu i te whārangi:

Raewyn Dalziel. Links and sources for 'Vogel, Julius', Dictionary of New Zealand Biography, first published in 1990, updated September, 2022. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/1v4/vogel-julius/sources (accessed 5 October 2023)