MLA

Ochoa Carrillo, Antonio, 1811-1883. Juárez, Benito. Autograph letter, signed: San Luis Potosí, to Antonio Ochoa Carrillo. Box 1, folder 70. 1867 April 24. https://collections.library.yale.edu/catalog/32320191.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 70"])(1867 April 24)[Juárez, Benito. Autograph letter, signed: San Luis Potosí, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320191.