MLA

Unions, Miners'. Annual Picnic and Excursion of the Miner's Unions ... 0AD. https://collections.library.yale.edu/catalog/2001055.

APA, 6th edition

Unions, M. (0 C.E.). Annual picnic and excursion of the Miner's Unions ... [Advertisements, Ephemera, Promotional literature]. https://collections.library.yale.edu/catalog/2001055.