MLA

Ochoa Carrillo, Antonio, 1811-1883. Corona, Ramón. Autograph letter, signed: Guadalajara, to Antonio Ochoa Carrillo. Box 1, folder 75. 1871 April 2. https://collections.library.yale.edu/catalog/32320225.

APA, 6th edition

Ochoa Carrillo, Antonio, 1811-1883. (["Box 1, folder 75"])(1871 April 2)[Corona, Ramón. Autograph letter, signed: Guadalajara, to Antonio Ochoa Carrillo]. https://collections.library.yale.edu/catalog/32320225.