MLA

Nowell, Frank H., 1864-1950. Flathead Chief - Montana. early 1900's. https://collections.library.yale.edu/catalog/2011198.

APA, 6th edition

Nowell, Frank H., 1864-1950. (early 1900's)[Flathead Chief - Montana]. https://collections.library.yale.edu/catalog/2011198.