MLA

Wagner, Henry R. (Henry Raup), 1862-1957. Expediente relativo al numero de familias introducida para el Empresario ... Estevan F. Austin..., Bexar and San Felipe de Austin, Texas.. Box 3, folder 81. 1831 Sep 12. https://collections.library.yale.edu/catalog/15237602.

APA, 6th edition

Wagner, Henry R. (Henry Raup), 1862-1957. (["Box 3, folder 81"])(1831 Sep 12)[Expediente relativo al numero de familias introducida para el Empresario ... Estevan F. Austin..., Bexar and San Felipe de Austin, Texas.]. https://collections.library.yale.edu/catalog/15237602.