MLA

Flandriae Tentonicae Pars Orientalior. G. et J. Blaeuw, 0AD. https://collections.library.yale.edu/catalog/15352348.

APA, 6th edition

Flandriae Tentonicae pars Orientalior. (0 C.E.). [Maps]. G. et J. Blaeuw, https://collections.library.yale.edu/catalog/15352348.