Cite

[Map of Balkan Peninsula and Eastern Europe].

MLA

[Map of Balkan Peninsula and Eastern Europe]. s.n., 1919. https://collections.library.yale.edu/catalog/15238179.

APA, 6th edition

[Map of Balkan Peninsula and Eastern Europe]. (1919). [Maps]. s.n., https://collections.library.yale.edu/catalog/15238179.