MLA

Ochoa Carrillo, Antonio, 1811-1883. Ochoa Carrillo, Antonio. Autograph draft letter: Guadalupe y Calvo, to General Ramón Corona. Box 1, folder 49. 1866 January 20. https://collections.library.yale.edu/catalog/32319972.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 49"])(1866 January 20)[Ochoa Carrillo, Antonio. Autograph draft letter: Guadalupe y Calvo, to General Ramón Corona]. https://collections.library.yale.edu/catalog/32319972.