MLA

Homann, Johann Baptist, 1663-1724. S.R.I. circulus Rhenanus inferior sive electorum Rheni complectens tres archiepiscopatus, Moguntinum, Coloniensem et Trevirensem, Palatinatum Rheni, Comit. Beilstein, Newenaer, Inf. Isenburg; et Reiferscheit / [cartographic material]. ca. 1715]. https://collections.library.yale.edu/catalog/2065640.

APA, 6th edition

Homann, Johann Baptist, 1663-1724. (ca. 1715])[S.R.I. circulus Rhenanus inferior sive electorum Rheni complectens tres archiepiscopatus, Moguntinum, Coloniensem et Trevirensem, Palatinatum Rheni, Comit. Beilstein, Newenaer, Inf. Isenburg; et Reiferscheit / [cartographic material]]. https://collections.library.yale.edu/catalog/2065640.