New South Wales. Dept. of Lands. Integration Surveys Division. (1976). Specifications for third order levelling. Department of Lands.
Chicago-referens (17:e uppl.)New South Wales. Dept. of Lands. Integration Surveys Division. Specifications for Third Order Levelling. Sydney: Department of Lands, 1976.
MLA-referens (8:e uppl.)New South Wales. Dept. of Lands. Integration Surveys Division. Specifications for Third Order Levelling. Department of Lands, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.