1. Spectroscopic Properties of Rare Earths (John Wiley, New York, 1965).
2. Theory of lanthanide crystal fields
3. and , The Effective Crystal-Field Potential (Elsevier, Amsterdam, 2000).
4. Angular Momentum in Quantum Mechanics (Princeton University Press, Princeton, New York, 1960).
5. The Theory of the Transition Metal Ions (Cambridge University Press, London, New York, 1961).