Killeen, S. M. (1939). The philosophy of labor according to Thomas Aquinas: A study in social philosophy. The Catholic University of Ameica Press.
Chicago-referens (17:e uppl.)Killeen, Sylvester Michael. The Philosophy of Labor According to Thomas Aquinas: A Study in Social Philosophy. Washington, D. C.: The Catholic University of Ameica Press, 1939.
MLA-referens (8:e uppl.)Killeen, Sylvester Michael. The Philosophy of Labor According to Thomas Aquinas: A Study in Social Philosophy. The Catholic University of Ameica Press, 1939.
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