MLA

Homann Erben (Firm). Bohemiae Regnum in XII Circulos divisum : cum Com. Glac. et Distr. Egerano ceterisq[ue] circumjacentibiis terris. ca. 1730?]. https://collections.library.yale.edu/catalog/2065577.

APA, 6th edition

Homann Erben (Firm). (ca. 1730?])[Bohemiae Regnum in XII Circulos divisum : cum Com. Glac. et Distr. Egerano ceterisq[ue] circumjacentibiis terris]. https://collections.library.yale.edu/catalog/2065577.