MLA

Koch, Frederick R. (Frederick Robinson). Music/La Foire Saint-Laurent. Box 169, folder 1511. 1876, n.d.. https://collections.library.yale.edu/catalog/12231359.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 169, folder 1511"])(1876, n.d.)[Music/La Foire Saint-Laurent]. https://collections.library.yale.edu/catalog/12231359.