Cite

[Photographs of El Paso County, Colorado].

MLA

Mellen, Geo. E. (George Egbert), 1854- , photographer. [Photographs of El Paso County, Colorado].. [circa 1880]. https://collections.library.yale.edu/catalog/2014631.

APA, 6th edition

Mellen, Geo. E. (George Egbert), 1854- , photographer. ([circa 1880])[[Photographs of El Paso County, Colorado].]. https://collections.library.yale.edu/catalog/2014631.