1. Linear Constrained Variational Procedure for LCAO–SCF Wavefunctions
2. and Molecular Vibrations, McGraw-Hill, New York, 1955 (reprinted by Dover in paperback).
3. Ordinary Differential Equations, Addison-Wesley, Reading, MA, 1961, p. 273 ff.
4. Physical Organic Chemistry, 2nd ed., McGraw-Hill, New York, 1970.