Levy-BruhlL.How Natives Think. New York: Washington Square Press, 1966 (Original French ed., 1910).
11.
MannA.“On the Numeral System of the Yoruba Nation.”Journal of Royal Anthropological Societyvol. 16 (1887): 59–64.
12.
MenningerKarl. Number Words and Number Symbols. Cambridge: M.I.T. Press, 1969. (Revised German ed.Göttingen, Germany: Vandenhoeck & Ruprecht, 1958.)
13.
MoiyoiOnesmo Ole. Personal communication.
14.
NgugiJames. The River Between. London: Heinemann, 1965.
15.
SchmidlMarianne. “Zahl and Zählen in Afrika.”Mitteilungen der Anthropologischen Gesellschaft in Wien35 (1915).
16.
SeidenbergA.“The Diffusion of Counting Practices.”University of California Publications in Mathematics, vol. 3, no. 4 (1960).
17.
SmeltzerDonald. Man and Number. New York: Emerson, 1958.
18.
SmithD. E.History of Mathematics, vol. 1. New York: Dover, 1958 (First ed.1923).
19.
WhiteL. A.“The Locus of Mathematical Reality: An Anthropological Footnote” in The World of Mathematics, ed. NewmanJ.vol. 4. New York: Simon & Schuster, 1956.
20.
WilderR. L.Evolution of Mathematical Concepts. New York: John Wiley, 1968.