MLA

Darley, Felix Octavius Carr, 1822-1888, artist. Lassoing wild horses. [1872?]. https://collections.library.yale.edu/catalog/2016474.

APA, 6th edition

Darley, Felix Octavius Carr, 1822-1888, artist. ([1872?])[Lassoing wild horses]. https://collections.library.yale.edu/catalog/2016474.