Hi, I'm looking for any sources like books, reviews, etc. that defines generally "Diffuse Reflectance Spectroscopy. I acknowledge any helps in advance.
You can Google Kubelka-Munk theory and you will find tons of references you can use. The original Kubelka-Munk theory was published many years ago as follows.
Kubelka, P.; Munk, F. Ein Beitrag Zur Optik Der Farbanstriche. Zeitschrift für Technische Physik 1931, 12, 593-601.