(1959) Mathematics: A house built on sand? (1960) (with Herbert S. Zuckerman) An Introduction to the Theory of Numbers, Wiley[6] (1961) Calculus: An Introductory Approach, Van Nostrand (1961) Numbers: Rational and Irrational, Random House (1963) Diophantine Approximations, Interscience (1965) Mathematics of Choice, MAA (1981) Maxima and Minima Without Calculus , MAA