The Warriors Soul
MLA
Conrad, Joseph, 1857-1924. The Warriors Soul. Box 22. 1916-1919, undated. https://collections.library.yale.edu/catalog/10606441.
APA, 6th edition
Conrad, Joseph, 1857-1924. (["Box 22"])(1916-1919, undated)[The Warriors Soul]. https://collections.library.yale.edu/catalog/10606441.