[Group of people standing and in carriages on a flat plain before a high bluff.]
MLA
Watkins, Carleton E., 1829-1916. [Group of people standing and in carriages on a flat plain before a high bluff.]. Folder 23. [ca. 1860-1861]. https://collections.library.yale.edu/catalog/2017956.
APA, 6th edition
Watkins, Carleton E., 1829-1916. (["Folder 23"])([ca. 1860-1861])[[Group of people standing and in carriages on a flat plain before a high bluff.]]. https://collections.library.yale.edu/catalog/2017956.