I used this book when I was studying Chromatography. I believe that it has a very good explanation of chromatography, its uses, and the different kinds of chromatography. Of course, you can also run a quick search for chromatography on OpenSource MIT classes. https://ocw.mit.edu/courses/chemistry/index.htm
Here is the book: https://www.amazon.com/gp/product/B001KR6YL6/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Hope this helps!