APA (7th ed.) Citation

Spence, M. D. (2020). Confluences: A historic resource study of Fort Union Trading Post National Historic Site, North Dakota and Montana. National Park Service.

Chicago Style (17th ed.) Citation

Spence, Mark David. Confluences: A Historic Resource Study of Fort Union Trading Post National Historic Site, North Dakota and Montana. [Washington, D.C.]: National Park Service, 2020.

MLA (9th ed.) Citation

Spence, Mark David. Confluences: A Historic Resource Study of Fort Union Trading Post National Historic Site, North Dakota and Montana. National Park Service, 2020.