MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 55. 1866 July 3. https://collections.library.yale.edu/catalog/32320026.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 55"])(1866 July 3)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320026.