NON-MONETARY MEDIA OF EXCHANGE
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Einzig, Paul. PRIMITIVE MONEY IN ITS ETHNOLOGICAL, HISTORICAL AND ECONOMIC ASPECTS. 2nd ed. Oxford: Pergamon Press, 1966.
Herskovits, Melville J. ECONOMIC ANTHROPOLOGY. New York: 1952.
Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. 2nd ed. Ocala, FL: First Impressions Printing, 1991.
Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978.
Taxay, Don. MONEY OF THE AMERICAN INDIANS AND OTHER PRIMITIVE CURRENCIES OF THE AMERICAS. New York: Nummus Press, 1970.