Skinner, Damien (2004). "Accidental Tourists: Ans Westra, Gregory Riethmaier and the National Publicity Studios in Rotorua". In Smith, Anna; Wevers, Lydia (eds.). On Display: New Essays in Cultural Studies. Victoria University Press. pp. 94–95. ISBN978-0-86473-454-9.
dpmc.govt.nz
"New Year honours list 2001". Department of the Prime Minister and Cabinet. 30 December 2000. Retrieved 16 February 2022.
health.govt.nz
Crawshaw, John (2011). "Forward"(PDF). Office of the Director of Mental Health: Annual Report. p. iii. Retrieved 16 February 2022.