Premier series North Dakota / edited, engraved, and published by The Geographical Publishing Co.
MLA
Co, Geographical Publishing. Premier Series North Dakota / Edited, Engraved, and Published by The Geographical Publishing Co. Geographical Publishing Co., 1911. https://collections.library.yale.edu/catalog/15814732.
APA, 6th edition
Co, G. P. (1911). Premier series North Dakota / edited, engraved, and published by The Geographical Publishing Co. [Maps]. Geographical Publishing Co., https://collections.library.yale.edu/catalog/15814732.