Não informado. (1950). Bibliographical Series. Department of Mines and Technical Surveys.
Chicago-referens (17:e uppl.)Não informado. Bibliographical Series. Ottawa: Department of Mines and Technical Surveys, 1950.
MLA-referens (8:e uppl.)Não informado. Bibliographical Series. Department of Mines and Technical Surveys, 1950.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.