MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 62. 1866 October 9. https://collections.library.yale.edu/catalog/32320148.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 62"])(1866 October 9)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320148.