1. J. A. Pople and D. L. Beveridge: Approximate Molecular Orbital Theory, McGraw-Hill (1970).
2. G. A Segal, Ed.: Semiempirical Methods of Electronic Structure Calculations, Part A, Plenum (1977).
3. J. N. Murrel and H. J. Harget: Semi-empirical Self-consistent-field Molecular Orbital Theory, Wiley (1976).
4. W. J. Hehre, L. Radom, P. v. R. Schleyer, and J. A. Pople: Ab initio Molecular Orbital Theory, Wiley (1986).
5. D. B. Cook: Ab initio Valence Calculations in Chemistry, Butterworths (1974).