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web.archive.org
Taonga, New Zealand Ministry for Culture and Heritage Te Manatu. "Cullen, John". www.teara.govt.nz (بالإنجليزية). Archived from the original on 2019-02-09. Retrieved 2016-11-07.
"New National Highway". New Zealand Herald. 6 مارس 1917. ص. 6. مؤرشف من الأصل في 2016-03-05. اطلع عليه بتاريخ 2016-06-24.