Cite

Map of the Western Railroads tributary to Philadelphia with their rival lines / prepared under the direction of Charles Ellet Jr., civil engineer ; by W. Williams, map engraver.

MLA

Ellet, Charles, 1810-1862. Map of the Western Railroads tributary to Philadelphia with their rival lines / prepared under the direction of Charles Ellet Jr., civil engineer ; by W. Williams, map engraver.. BRBL_00411. 1851. https://collections.library.yale.edu/catalog/15603736.

APA, 6th edition

Ellet, Charles, 1810-1862. (["BRBL_00411"])(1851)[Map of the Western Railroads tributary to Philadelphia with their rival lines / prepared under the direction of Charles Ellet Jr., civil engineer ; by W. Williams, map engraver.]. https://collections.library.yale.edu/catalog/15603736.