Cite

"Sonata No. 11 - Beethoven," watercolor on paper board

MLA

Stieglitz, Alfred, 1864-1946. "Sonata No. 11 - Beethoven," watercolor on paper board. Box 159, folder 2919. 1907. https://collections.library.yale.edu/catalog/2002422.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 159, folder 2919"])(1907)["Sonata No. 11 - Beethoven," watercolor on paper board]. https://collections.library.yale.edu/catalog/2002422.