Condorcet, M.J. (1794/1966). Esquisse d'un tableau historique des progrès de l'esprit humain. (Sketch of a historical picture of the progress of the human mind). Paris: Editions Sociales.
2.
Herder, J.G. (1772). On the origin of language. In Werke (1969). (5 vols.), Berlin: Aufbau.
3.
Kroeber, A.L. & Kluckhohn, C. (1952). Culture: A critical review of concepts and definitions . Cambridge, MA: Peabody Museum . Wundt, W. (1909). Völkerpsychologie, volume 2: Mythus und religions (Second edition), part 3. Leipzig : Engelmann.
