I was fortunate to be able to buy my own copy of "Quantrill's Civil War Operations in Indian Territory" by Fischer and Rampp (1968) on eBay early last year. If one is unable to get one through Interlibrary Loan, I'd suggest you do a search for the book under its title and authors. It contains a lot of valuable information for those interested in Quantrill's Guerrillas, their actions, and their leaders and goes into detail about the trouble between Quantrill, some of his leaders including Bill Anderson, and Confederate authorities in the winter of 1863/64.
~Jay Longley