MLA

Michler, N. (Nathaniel), 1827-1881. General sketch of the survey for an interoceanic ship canal near the Isthmus of Darien via the Rivers Atrato and Truandó / made in accordance with the Act of Congress of March 3rd, 1857, under the direction of the Hon. Secretaries of War and of the Navy. BRBL_00658. 1859?]. https://collections.library.yale.edu/catalog/15822428.

APA, 6th edition

Michler, N. (Nathaniel), 1827-1881. (["BRBL_00658"])(1859?])[General sketch of the survey for an interoceanic ship canal near the Isthmus of Darien via the Rivers Atrato and Truandó / made in accordance with the Act of Congress of March 3rd, 1857, under the direction of the Hon. Secretaries of War and of the Navy]. https://collections.library.yale.edu/catalog/15822428.