Não informado. (1958). Information circular. Mines Branch, Department of Energy, Mines and Resources.
Chicago-referens (17:e uppl.)Não informado. Information Circular. Ottawa: Mines Branch, Department of Energy, Mines and Resources, 1958.
MLA-referens (8:e uppl.)Não informado. Information Circular. Mines Branch, Department of Energy, Mines and Resources, 1958.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.