MLA

Bruff, Joseph Goldsborough, 1804-1889. An account of the great emmigration across the continent, to California, in 1849. Adventures in California &c. &c. with copious illustrations ... in California ... by J. Goldsborough Bruff of Washington City. Box 1. 1849 April 2-August 27. https://collections.library.yale.edu/catalog/2112234.

APA, 6th edition

Bruff, Joseph Goldsborough, 1804-1889. (["Box 1"])(1849 April 2-August 27)[An account of the great emmigration across the continent, to California, in 1849. Adventures in California &c. &c. with copious illustrations ... in California ... by J. Goldsborough Bruff of Washington City]. https://collections.library.yale.edu/catalog/2112234.