Colorado No. 12.C.
MLA
Ingersoll, Ernest, 1852-1946, Jackson, William Henry, 1843-1942. Colorado No. 12.C.. https://collections.library.yale.edu/catalog/2018656.
APA, 6th edition
Ingersoll, Ernest, 1852-1946, & Jackson, William Henry, 1843-1942. [Colorado No. 12.C.]. https://collections.library.yale.edu/catalog/2018656.