MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 68. 1866 December 4. https://collections.library.yale.edu/catalog/32320179.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 68"])(1866 December 4)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320179.