MLA

Crane, Walter, 1845-1915. [Drawing of Robert Louis Stevenson laying down while smoking with a donkey nearby and a village scene in the background]. [ca. 1879]. https://collections.library.yale.edu/catalog/2039636.

APA, 6th edition

Crane, Walter, 1845-1915. ([ca. 1879])[[Drawing of Robert Louis Stevenson laying down while smoking with a donkey nearby and a village scene in the background]]. https://collections.library.yale.edu/catalog/2039636.