MLA

Flinn, John J. (John Joseph), 1851-1929. Official guide to the World's Columbian Exposition in the city of Chicago ... May 1 to October 26, 1893 .... [c1893]. https://collections.library.yale.edu/catalog/33564746.

APA, 6th edition

Flinn, John J. (John Joseph), 1851-1929. ([c1893])[Official guide to the World's Columbian Exposition in the city of Chicago ... May 1 to October 26, 1893 ...]. https://collections.library.yale.edu/catalog/33564746.