(1) Durkheim, É. De la division du travail social. 2d ed. Paris, 1902.
(2) Cooley, Charles H. Social Organization. A study of the larger mind. Part V, "Institutions," pp. 313-92. New York, 1909.
(3) Salz, Arthur. "Zur Geschichte der Berufsidee," Archiv für Sozialwissenschaft, XXXVII (1913), 380-423.
(4) Rivers, W. H. R. Kinship and Social Organization. Studies in economic and political science. London, 1914.
(5) Schurtz, Heinrich. Altersklassen und Männerbünde. Eine Darstellung der Grundformen der Gesellschaft. Berlin, 1902.
(6) Vierkandt, A. "Die politischen Verhältnisse der Naturvölker," Zeitschrift für Sozialwissenschaft, IV, 417-26, 497-510.
(7) Lowie, Robert H. Primitive Society. Chap. x, "Associations," chap. xi, "Theory of Associations," pp. 257-337. New York, 1920.
(8) Zimmern, Alfred E. The Greek Commonwealth. Politics and economics in fifth-century Athens. 2d rev. ed. Oxford, 1915.
(9) Thomas, William I. Source Book for Social Origins. Ethnological materials, psychological standpoint, classified and annotated bibliographies for the interpretation of savage society. Part VII, "Social Organization, Morals, the State," pp. 753-869. Chicago, 1909. [Bibliography.]