Cite

From top of gorge, looking east.

MLA

Ingersoll, Ernest, 1852-1946, Jackson, William Henry, 1843-1942. From top of gorge, looking east.. https://collections.library.yale.edu/catalog/2018683.

APA, 6th edition

Ingersoll, Ernest, 1852-1946, & Jackson, William Henry, 1843-1942. [From top of gorge, looking east.]. https://collections.library.yale.edu/catalog/2018683.