1. A. L. Kroeber (ed.), Anthropology Today (University of Chicago Press, 1953) p. 569.
2. I. A. Richards, in H. von Foerster (ed.), Cybernetics (New York: Josiah Macy Jr. Foundation, 1952) p. 53.
3. J. Ruesch and G. Bateson, Communication: the Social Matrix of Psychiatry (New York: Norton, 1951) pp. 33, 282.
4. A. L. Kroeber and C. Kluckhohn, Culture: a Critical Review of Concepts and Definitions (Cambridge, Mass: Peabody Museum of American Archaeology and Ethnology, 1952).
5. D. Bidney, American Journal of Sociology, 59 (1954) pp. 488–9.