MLA

Gifford, Charles B., and printmaker. First Annual Encampment of the Second Brigade, California Militia Camp Allen, Encinal Alameda, October 1863, Brigadier-General John S. Ellis Commanding / [Graphic]. Printed by L. Nagel, 0AD. https://collections.library.yale.edu/catalog/15808935.

APA, 6th edition

Gifford, C. B., & printmaker. (0 C.E.). First annual encampment of the Second Brigade, California Militia Camp Allen, Encinal Alameda, October 1863, Brigadier-General John S. Ellis commanding / [graphic] [Historical reenactments, Lithographs California San Francisco 1863]. Printed by L. Nagel. https://collections.library.yale.edu/catalog/15808935.