Beiler, A. H. (1966). Recreations in the theory of numbers: The queen of mathematics entertains (2nd ed.). New York: Dover publications, Inc..
Παραπομπή Chicago StyleBeiler, Albert H. Recreations in the Theory of Numbers: The Queen of Mathematics Entertains. 2nd ed. New York: Dover publications, Inc., 1966.
Παραπομπή MLABeiler, Albert H. Recreations in the Theory of Numbers: The Queen of Mathematics Entertains. 2nd ed. New York: Dover publications, Inc., 1966.
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