^[1] Gustav Casel, The Theory of Social Economy, trad. de S. L. Banon, p. 371, nueva ed., Londres 1932 [tr. esp.: Economía social teórica, 5.^a ed., Aguilar, Madrid 1960]. <<

^[2] V. Adam Ferguson, An Essay on the History of Civil Society, p. 208, nueva ed., Basilea 1789 [tr. esp. del Instituto de Estudios Políticos, Madrid 1974]. <<

^[3] V. Herbert Spencer, The Principles of Sociology, cap. III, pp. 575-611, Nueva York 1914. <<

^[4] V. Werner Sombart, Haendler und Helden, Múnich 1915. <<

^[5] V. Frederick Engels, The Origin of the Family, Private Property and the State, p. 144, Nueva York 1942. <<