Cite

"Trillium." Watercolor, 20.4 x 13.9 cm.

MLA

Stenzel, Franz (1906-1998). "Trillium." Watercolor, 20.4 x 13.9 cm.. Box 5, folder 77. n.y. Mar 10. https://collections.library.yale.edu/catalog/33228849.

APA, 6th edition

Stenzel, Franz (1906-1998). (["Box 5, folder 77"])(n.y. Mar 10)["Trillium." Watercolor, 20.4 x 13.9 cm.]. https://collections.library.yale.edu/catalog/33228849.