MLA

Mercator, Gerhard, 1512-1594. Saltzburg archiepiscopatus cum ducatu Carinthiae / [cartographic material] / per Gerardum Mercatorem .... BRBL_00246. 1627 [i.e. 1636]. https://collections.library.yale.edu/catalog/15498059.

APA, 6th edition

Mercator, Gerhard, 1512-1594. (["BRBL_00246"])(1627 [i.e. 1636])[Saltzburg archiepiscopatus cum ducatu Carinthiae / [cartographic material] / per Gerardum Mercatorem ...]. https://collections.library.yale.edu/catalog/15498059.