MLA

Warren, Gouverneur Kemble, 1830-1882. Map of the territory of the United States from the Mississippi to the Pacific Ocean : ordered by Jeff'n Davis, Secretary of War to accompany the reports of the explorations for a railroad route / compiled from authorized explorations and other reliable da. BRBL_00534. 1858?]. https://collections.library.yale.edu/catalog/15812945.

APA, 6th edition

Warren, Gouverneur Kemble, 1830-1882. (["BRBL_00534"])(1858?])[Map of the territory of the United States from the Mississippi to the Pacific Ocean : ordered by Jeff'n Davis, Secretary of War to accompany the reports of the explorations for a railroad route / compiled from authorized explorations and other reliable da]. https://collections.library.yale.edu/catalog/15812945.