Cite

Hungary, population density

MLA

Wallis, B. C. (Bertie Cotterell), cartographer. Hungary, population density. [1918]. https://collections.library.yale.edu/catalog/15238052.

APA, 6th edition

Wallis, B. C. (Bertie Cotterell), cartographer. ([1918])[Hungary, population density]. https://collections.library.yale.edu/catalog/15238052.