Haurongo: van Asch, Henry Piet Drury
He whakaaturanga anō
Rārangi pukapuka
Conly, G. Piet’s eye in the sky. Wellington, 1986
Obit. Daily Telegraph. 8 Nov. 1996: 16
Wright, M. ‘Monospar faithful friend of pioneer’. New Zealand Herald. 29 Oct. 1991 (Section 3): 8