MLA

Blaeu, Joan, 1596-1673. Theatrum orbis terrarum, Blaeu, Willem Janszoon, 1571-1638. Theatrum orbis terrarum, Freitag, Gérard, Metius, Adriaan, 1570-1635. Frisia occidentalis / [cartographic material] / Adriano Metio et Gerardo Freitag.. BRBL_00081. [1635?]. https://collections.library.yale.edu/catalog/15352239.

APA, 6th edition

Blaeu, Joan, 1596-1673. Theatrum orbis terrarum, & Blaeu, Willem Janszoon, 1571-1638. Theatrum orbis terrarum, & Freitag, Gérard, & Metius, Adriaan, 1570-1635. (["BRBL_00081"])([1635?])[Frisia occidentalis / [cartographic material] / Adriano Metio et Gerardo Freitag.]. https://collections.library.yale.edu/catalog/15352239.