MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo. Box 1, folder 60. 1866 August 28. https://collections.library.yale.edu/catalog/32320091.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 60"])(1866 August 28)[Juárez, Benito. Autograph letter, signed: Chihuahua, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320091.