Map of the United States and the Provinces of Upper and Lower Canada, New Brunswick and Nova Scotia ... by John & Alexr. Walker.
MLA
Map of the United States and the Provinces of Upper and Lower Canada, New Brunswick and Nova Scotia ... by John & Alexr. Walker. J. & A. Walker, 1827. https://collections.library.yale.edu/catalog/15604162.
APA, 6th edition
Map of the United States and the Provinces of Upper and Lower Canada, New Brunswick and Nova Scotia ... by John & Alexr. Walker. (1827). [Maps]. J. & A. Walker, https://collections.library.yale.edu/catalog/15604162.