MLA

Swain, William, 1821-1904. Journal of route to California from my home in Youngstown by way of the Buffalo, Detroit, Chicago, St. Louis, and Independence: commencing April 11th, 1849. Folder 1. 1849. https://collections.library.yale.edu/catalog/2002791.

APA, 6th edition

Swain, William, 1821-1904. (["Folder 1"])(1849)[Journal of route to California from my home in Youngstown by way of the Buffalo, Detroit, Chicago, St. Louis, and Independence: commencing April 11th, 1849]. https://collections.library.yale.edu/catalog/2002791.