Cite

[Map of area in dispute between Belgium and Germany.]

MLA

[Map of Area in Dispute between Belgium and Germany.]. s.n., 191AD. https://collections.library.yale.edu/catalog/15238025.

APA, 6th edition

[Map of area in dispute between Belgium and Germany.]. (191 C.E.). [Maps]. s.n., https://collections.library.yale.edu/catalog/15238025.