Cite

[Facsimile map of Saarbrücken, Germany].

MLA

[Facsimile Map of Saarbrücken, Germany]. OSS?, 0AD. https://collections.library.yale.edu/catalog/15476497.

APA, 6th edition

[Facsimile map of Saarbrücken, Germany]. (0 C.E.). [Maps]. OSS?, https://collections.library.yale.edu/catalog/15476497.