MLA

Valck, G. (Gerard), 1651 or 1652-1726. Circulus Suevicus complectens omnes status subdivisos ex quibus constat [cartographic material].. [ca. 1702?]. https://collections.library.yale.edu/catalog/16618352.

APA, 6th edition

Valck, G. (Gerard), 1651 or 1652-1726. ([ca. 1702?])[Circulus Suevicus complectens omnes status subdivisos ex quibus constat [cartographic material].]. https://collections.library.yale.edu/catalog/16618352.