1. J. Tropfke,Geschichte der Elementarmathematik, 4th ed., Berlin: de Gruyter, (1980).
2. A. Beck, M. N. Bleicher, and D. W. Crowe,Excursions into Mathematics, New York: Worth (1969).
3. L. E. Dickson,History of the Theory of Numbers, Vol. I, New York: Chelsea (1952).
4. G. H. Hardy and E. M. Wright,An Introduction to the Theory of Numbers, 2nd ed., London: Clarendon Press, 1945.
5. K. O. May, Historiographic vices I. Logical attribution,Historia Math. 2 (1975), 185–187.