(1932) A Symposium: The Aim and Content of Graduate Training in Ethics, with George P. Adams, C. J. Ducasse, Walter Goodnow Everett, DeWitt Parker, F.C. Sharp & J.H. Turfs, International Journal of Ethics 43 (1):53-64.
(1929) On the Notion of Value, Philosophical Review 38 (4):303-325.