MLA

Valck, G. (Gerard), 1651-1726. Circulus Franconicus divisa in Ducatus Coburgi, Franconiae, et Episcopatus Wurtzburgi, Bambergae, et Stadii., Marchionatus Culmbachii, et Onspachii, Comitatus Hennenbergae, Rheineci, Werthemii, Erpachia, Limburgi, Hollae, Suartenburgi, et Castellae / [cartographic material]. ca. 1702?]. https://collections.library.yale.edu/catalog/16618357.

APA, 6th edition

Valck, G. (Gerard), 1651-1726. (ca. 1702?])[Circulus Franconicus divisa in Ducatus Coburgi, Franconiae, et Episcopatus Wurtzburgi, Bambergae, et Stadii., Marchionatus Culmbachii, et Onspachii, Comitatus Hennenbergae, Rheineci, Werthemii, Erpachia, Limburgi, Hollae, Suartenburgi, et Castellae / [cartographic material]]. https://collections.library.yale.edu/catalog/16618357.