MLA

Hardcastle, E. L. F. (Edmund Lafayette), 1824-1899. Map of the Valley of Mexico / Edmdd. L.F. Hardcastle, Bvt. 2d Lieut. top. eng. ; A. Kollner eng.. BRBL_00647. [1847?]. https://collections.library.yale.edu/catalog/15822305.

APA, 6th edition

Hardcastle, E. L. F. (Edmund Lafayette), 1824-1899. (["BRBL_00647"])([1847?])[Map of the Valley of Mexico / Edmdd. L.F. Hardcastle, Bvt. 2d Lieut. top. eng. ; A. Kollner eng.]. https://collections.library.yale.edu/catalog/15822305.