Haurongo: Duncan, David rāua ko Duncan, Peter
He whakaaturanga anō
Rārangi pukapuka
Furkert, F. W. Early New Zealand engineers. Wellington, 1953
Macdonald, G. R. Biographical card index. MS. CMU
Obit. [D. Duncan]. Press. 2 July 1897
Obit. [P. Duncan]. Press. 5 Feb. 1907