[U.S. Exploring Expedition Pacific Ocean] Engraved by Sherman and Smith, New York. By the U.S. Ex.Ex.
MLA
[U.S. Exploring Expedition Pacific Ocean] Engraved by Sherman and Smith, New York. By the U.S. Ex.Ex. 1840. https://collections.library.yale.edu/catalog/15235155.
APA, 6th edition
[U.S. Exploring Expedition Pacific Ocean] Engraved by Sherman and Smith, New York. By the U.S. Ex.Ex. (1840). [Maps]. https://collections.library.yale.edu/catalog/15235155.