MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 57. 1866 July 24. https://collections.library.yale.edu/catalog/32320045.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 57"])(1866 July 24)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320045.