Não informado. Publications of the Earth Physics Branch. Department of Energy, Mines and Resources.
Chicago-referens (17:e uppl.)Não informado. Publications of the Earth Physics Branch. Ottawa: Department of Energy, Mines and Resources.
MLA-referens (8:e uppl.)Não informado. Publications of the Earth Physics Branch. Department of Energy, Mines and Resources.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.