MLA

[Charles Koppel]. U.S.P.R.R. Exp. & Surveys.--Cal. Plate XII. Mission of San Diego. Report of explorations in California for railroad routes, to connect with the routes near the 35th and 32nd parallels of north latitude by Lieutenant R. S. Williamson1853. Volume V from Reports of explorations and surveys, to ascertain the most practicab. ca. 1855. https://collections.library.yale.edu/catalog/2015587.

APA, 6th edition

[Charles Koppel]. (["Report of explorations in California for railroad routes, to connect with the routes near the 35th and 32nd parallels of north latitude by Lieutenant R. S. Williamson1853. Volume V from Reports of explorations and surveys, to ascertain the most practicab"])(ca. 1855)[U.S.P.R.R. Exp. & Surveys.--Cal. Plate XII. Mission of San Diego]. https://collections.library.yale.edu/catalog/2015587.