MLA

Garella, Napoléon, 1809-1858. Map of the Isthmus between Chagres and Panama : (Panama Rail Road added.) / by Chief Engineer Napoleon Garella, 1845; drawn by E. Hergesheimer.. BRBL_00658. 1867]. https://collections.library.yale.edu/catalog/15822423.

APA, 6th edition

Garella, Napoléon, 1809-1858. (["BRBL_00658"])(1867])[Map of the Isthmus between Chagres and Panama : (Panama Rail Road added.) / by Chief Engineer Napoleon Garella, 1845; drawn by E. Hergesheimer.]. https://collections.library.yale.edu/catalog/15822423.