MLA

[Map of Thunder Bay District, Canada, Showing Silver Lands Owned by Peter Mitchell & Others, Sept. 7th, 1872]. 0AD. https://collections.library.yale.edu/catalog/16680806.

APA, 6th edition

[Map of Thunder Bay District, Canada, showing silver lands owned by Peter Mitchell & others, Sept. 7th, 1872]. (0 C.E.). [Cadastral maps, Manuscript maps]. https://collections.library.yale.edu/catalog/16680806.