1. “Reflectance Spectroscopy, Principles, Methods and Applications”;Kortüm,1969
2. “Reflectance Spectroscopy”;Wendlandt,1966
3. “Modern Aspects of Reflectance Spectroscopy”,1968
4. “Diffuse Reflectance Spectroscopy in Environmental Problem Solving”;Frei,1973
5. The interpretation of diffuse reflectance spectra