MLA

of Canada, Geological Survey. Nanaimo Sheet, Vancouver Island, British Columbia / C.-O. Senécal, Geographer and Chief Draughtsman. Canada, Dept. of Mines, Geological Survey, 1915. https://collections.library.yale.edu/catalog/15536294.

APA, 6th edition

of Canada, G. S. (1915). Nanaimo sheet, Vancouver Island, British Columbia / C.-O. Senécal, geographer and chief draughtsman. [Maps]. Canada, Dept. of Mines, Geological Survey, https://collections.library.yale.edu/catalog/15536294.