MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 61. 1866 September 25. https://collections.library.yale.edu/catalog/32320143.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 61"])(1866 September 25)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320143.