MLA

Mercator, Gerhard, 1512-1594, Mercator, Rumold, ca. 1545-1599. Europa, ad magnae Europae Gerardi Mercatoris P. imitationem / Rumoldi Mercatoris F. cura, edita .... BRBL_00029. https://collections.library.yale.edu/catalog/12221977.

APA, 6th edition

Mercator, Gerhard, 1512-1594, & Mercator, Rumold, ca. 1545-1599. (["BRBL_00029"])[Europa, ad magnae Europae Gerardi Mercatoris P. imitationem / Rumoldi Mercatoris F. cura, edita ...]. https://collections.library.yale.edu/catalog/12221977.