Cite

Schenker's map of Central Europe indicating the principal routes comprised in their system of Continental travel tickets.

MLA

Schenker's Map of Central Europe Indicating the Principal Routes Comprised in Their System of Continental Travel Tickets. 0AD. https://collections.library.yale.edu/catalog/15259108.

APA, 6th edition

Schenker's map of Central Europe indicating the principal routes comprised in their system of Continental travel tickets. (0 C.E.). [Maps]. https://collections.library.yale.edu/catalog/15259108.