↑ Porter, John, Surveyor-General of South Australia (1990年4月). AN HISTORICAL PERSPECTIVE - Longitude 129 degrees east, and why it is not the longest, straight line in the world. National Perspectives: 32nd Australian Surveyors Congress Technical Papers 31 March - 6 April 1990. Canberra: The Institution: Eyepiece - Official Organ of The Institution of Surveyors, Australia, W.A. Division (published 1990年6月). pp.18–24. Porter.{{cite conference}}: CS1メンテナンス: 複数の名前/author (カテゴリ). 2012年1月16日閲覧。
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