MLA

Lorenz, William, 1826-1884. Map showing the main line and branches of the Philadelphia and Reading Rail Road Co. / Wm. Lorenz, chf. engr., March 1st, 1876.. BRBL_00501A. 1876. https://collections.library.yale.edu/catalog/15827673.

APA, 6th edition

Lorenz, William, 1826-1884. (["BRBL_00501A"])(1876)[Map showing the main line and branches of the Philadelphia and Reading Rail Road Co. / Wm. Lorenz, chf. engr., March 1st, 1876.]. https://collections.library.yale.edu/catalog/15827673.