Cite

Ethnographical Map of Central & South Eastern Europe.

MLA

Geological Survey (U.S.). Ethnographical Map of Central & South Eastern Europe.. BRBL_00034A. 1916. https://collections.library.yale.edu/catalog/15259117.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00034A"])(1916)[Ethnographical Map of Central & South Eastern Europe.]. https://collections.library.yale.edu/catalog/15259117.