Ruins in ancient Pueblo of San Juan, Colorado"
MLA
O'Sullivan, Timothy H., 1840-1882. Ruins in ancient Pueblo of San Juan, Colorado". Box 46. ca. 1873. https://collections.library.yale.edu/catalog/2003078.
APA, 6th edition
O'Sullivan, Timothy H., 1840-1882. (["Box 46"])(ca. 1873)[Ruins in ancient Pueblo of San Juan, Colorado"]. https://collections.library.yale.edu/catalog/2003078.