Não informado. (1958). Information circular. Mines Branch, Department of Energy, Mines and Resources.
Chicago-Zitierstil (17. Ausg.)Não informado. Information Circular. Ottawa: Mines Branch, Department of Energy, Mines and Resources, 1958.
MLA-Zitierstil (8. Ausg.)Não informado. Information Circular. Mines Branch, Department of Energy, Mines and Resources, 1958.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.