MLA

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. "a critical comparison of Scholastic and Modern Ethics" Thesis in Philosophy IV, holograph, 52 p., with notes and comments by William James. Box 3, folder 57. 1889. https://collections.library.yale.edu/catalog/10191170.

APA, 6th edition

Du Bois, W. E. B. (William Edward Burghardt), 1868-1963. (["Box 3, folder 57"])(1889)["a critical comparison of Scholastic and Modern Ethics" Thesis in Philosophy IV, holograph, 52 p., with notes and comments by William James]. https://collections.library.yale.edu/catalog/10191170.