Robert Atkinson painting
MLA
Beinecke, Edwin J. (Edwin John), 1886-1970. Robert Atkinson painting. Box 67, folder 1548. 1891 February 21. https://collections.library.yale.edu/catalog/2039635.
APA, 6th edition
Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 67, folder 1548"])(1891 February 21)[Robert Atkinson painting]. https://collections.library.yale.edu/catalog/2039635.