MLA

Johnston, Alexander Keith, 1804-1871. Johnston's map of the Black Sea : with the adjacent countries including portion of Turkey in Asia, Caucasus, Crimea &c.. BRBL_00284. 1854. https://collections.library.yale.edu/catalog/15506436.

APA, 6th edition

Johnston, Alexander Keith, 1804-1871. (["BRBL_00284"])(1854)[Johnston's map of the Black Sea : with the adjacent countries including portion of Turkey in Asia, Caucasus, Crimea &c.]. https://collections.library.yale.edu/catalog/15506436.