Leuba, J. H. A Psychological Study of Religion (New York, 1912).
Kant, Immanuel. Kritik der praktischen Vernunft (4th ed., Riga, 1797), and see his Collected Works (Berlin, 1912- ). [589]
Martineau, James. The Relations between Ethics and Religion (London, 1881).
Guyau, J. M. Esquisse d'une morale sans obligation ni sanction (Paris, 1885; 4th ed., 1896; Eng. tr., London, 1898); L'irreligion de l'avenir (Paris, 1887).
Palmer, G. H. The Field of Ethics (Boston, 1901).
Otto, R. Naturalism and Religion (Eng. tr., London and New York, 1909).
General Descriptive Works
Cicero. De Fato and De Natura Deorum.
Brosses, C. de. Du culte des dieux fétiches (Paris or Geneva, 1760).
Dupuis, C. F. Origine de tous les cultes, ou religion universelle (Paris, 1794; new ed., 1870).