MLA

Keere, Pieter van den, 1571-approximately 1646. Pontos Euxeinos = Pontus Euxinus : æquor Iasonio pulsatum remige primum / ex conatibus Abrahami Ortelii ; Petrus Kaerius caelavit.. [1652?]. https://collections.library.yale.edu/catalog/16691746.

APA, 6th edition

Keere, Pieter van den, 1571-approximately 1646. ([1652?])[Pontos Euxeinos = Pontus Euxinus : æquor Iasonio pulsatum remige primum / ex conatibus Abrahami Ortelii ; Petrus Kaerius caelavit.]. https://collections.library.yale.edu/catalog/16691746.