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3. Barth, F. (1969). Ethnic groups and boundaries. Boston: Little, Brown and Company.
4. Barton, B. (1996). Anthropological perspectives on mathematics and mathematics education. In A.J. Bishop, K. Clements, C. Keitel, J. Kilpatrick & C. Laborde (Eds.), International handbook of mathematics education. (pp. 1035–1053) Dordrecht: Kluwer.
5. Becker, E. (1962). The birth and death of meaning. New York: The Free Press