MLA

Clift, Emory W., d. 1886. Exploration for wagon road from Fort Ellis, M.T., to mouth of Muscleshell River / by Capt. E.W. Clift, 13th Infty. ; Office of Engineers, H'd. Q'rs., Dep't of Dakota ; reduced from field notes of Geo. B. Foote, C.E., 1869 Nov 9. 1869. https://collections.library.yale.edu/catalog/2016960.

APA, 6th edition

Clift, Emory W., d. 1886. (1869)[Exploration for wagon road from Fort Ellis, M.T., to mouth of Muscleshell River / by Capt. E.W. Clift, 13th Infty. ; Office of Engineers, H'd. Q'rs., Dep't of Dakota ; reduced from field notes of Geo. B. Foote, C.E., 1869 Nov 9]. https://collections.library.yale.edu/catalog/2016960.