1. Spectra and Energy Levels of Rare Earth Ions in Crystals, Interscience Publishers, New York, 1968 (und dort angegebene Literaturzitate).
2. Optical Spectra of Transparent Rare Earth Compounds Academic Press, New York 1978, S. 85 (und dort angegebene Literaturzitate).
3. , Spectroscopic Properties of Triply Ionized Lanthanides in Transparent Host Materials, in (Hrsg.), Handbook on the Physics and Chemistry of Rare Earths, Band 5, Kap. 46, North Holland Publishers, New York 1982 (und dort angegebene Literaturzitate).
4. , Rationalization of Crystal Field Parametrization, in (Hrsg.), Handbook on the Physics and Chemistry of Rare Earths, Band 23, Kap. 155, Elsevier, Amsterdam 1996 (und dort angegebene Literaturzitate).