MLA

Ducatus Bremae Et Ferdae ... Joh. Bapt. Homanno, 0AD. https://collections.library.yale.edu/catalog/15483085.

APA, 6th edition

Ducatus Bremae et Ferdae ... (0 C.E.). [Maps]. Joh. Bapt. Homanno, https://collections.library.yale.edu/catalog/15483085.