MLA

Horsley, John, 1675-1732, cartographer, Laurie, Richard Holmes. Britanniæ Antiquæ [cartographic material] : tabula geographica ex ævi Romani monumentis / ab eruditissimo viro Johanne Horsley ... recentissinmus observationibus concinnata.. BRBL_00041. 1821. https://collections.library.yale.edu/catalog/15259719.

APA, 6th edition

Horsley, John, 1675-1732, cartographer, & Laurie, Richard Holmes. (["BRBL_00041"])(1821)[Britanniæ Antiquæ [cartographic material] : tabula geographica ex ævi Romani monumentis / ab eruditissimo viro Johanne Horsley ... recentissinmus observationibus concinnata.]. https://collections.library.yale.edu/catalog/15259719.