Travels to the source of the Missouri River and across the American continent to the Pacific Ocean ...
MLA
Travels to the Source of the Missouri River and across the American Continent to the Pacific Ocean ... 0AD. https://collections.library.yale.edu/catalog/2000890.
APA, 6th edition
Travels to the source of the Missouri River and across the American continent to the Pacific Ocean ... (0 C.E.). [Title pages]. https://collections.library.yale.edu/catalog/2000890.