"Upper Cascades, Columbia River." Watercolor, 23.5 x 30.6 cm.
MLA
Stenzel, Franz. "Upper Cascades, Columbia River." Watercolor, 23.5 x 30.6 Cm. 1857. https://collections.library.yale.edu/catalog/10858269.
APA, 6th edition
Stenzel, F. (1857). "Upper Cascades, Columbia River." Watercolor, 23.5 x 30.6 cm. https://collections.library.yale.edu/catalog/10858269.