Austria Hungary, Scale 1:3,000,000.
MLA
Austria Hungary, Scale 1:3,000,000. s.n., 1919. https://collections.library.yale.edu/catalog/15238167.
APA, 6th edition
Austria Hungary, Scale 1:3,000,000. (1919). [Europe, Eastern--Maps, Maps]. s.n., https://collections.library.yale.edu/catalog/15238167.