MLA

Mercator, Gerhard, 1512-1594. Saltzburg archiepiscopatus, et Carinthia ducatus / [cartographic material] / auctore Ger. Mercatore.. BRBL_00246. [1635]. https://collections.library.yale.edu/catalog/15498061.

APA, 6th edition

Mercator, Gerhard, 1512-1594. (["BRBL_00246"])([1635])[Saltzburg archiepiscopatus, et Carinthia ducatus / [cartographic material] / auctore Ger. Mercatore.]. https://collections.library.yale.edu/catalog/15498061.