(1) Maine, Henry S. Dissertations on Early Law and Custom. New York, 1886.
(2) Kocourek, Albert, and Wigmore, John H., editors. Evolution of Law. Select readings on the origin and development of legal institutions. Vol. I, "Sources of Ancient and Primitive Law." Vol. II, "Primitive and Ancient Legal Institutions." Vol. III, "Formative Influences of Legal Development." Boston, 1915.
(3) Sumner, W. G. Folkways. A study of the sociological importance of usages, manners, customs, mores, and morals. Boston, 1906.
(4) Letourneau, Ch. L'Évolution de la morale. Paris, 1887.
(5) Westermarck, Edward. The Origin and Development of the Moral Ideas, 2 vols. London, 1906-8.
(6) Hobhouse, L. T. Morals in Evolution. New ed. A study in comparative ethics. New York, 1915.
(7) Durkheim, Émile. The Elementary Forms of the Religious Life. A study in religious sociology. Translated from the French by J. W. Swain. London, 1915.
(8) Novicow, J. Conscience et volonté sociales. Paris, 1897.
(9) Ross, Edward A. Social Control. A survey of the foundations of order. New York, 1906.
(10) Bernard, Luther L. The Transition to an Objective Standard of Social Control. Chicago, 1911.