You've come to the right place. I am one of the few people around boring enough to be fascinated by the weird, disturbing, and generally bonkers world of Bleeding Kansas. Some resources:

The best book out there on it is Etcheson's Bleeding Kansas: Contested Liberty in the Civil War Era. The two prior modern histories are more concerned with national political effects (Rawley's Race and Politics: "Bleeding Kansas and the Coming of the Civil War") and Alice Nichols Bleeding Kansas. Rawley isn't bad, but his book is less about Kansas than about what Kansas does politically to the nation. Nichols is badly dated work by a non-historian that got to be the standard text for decades because no one else wrote one.

For primary sources, the best overview you can ask for until spring of 1856 is the Howard Report. It's loaded with testimony from people actually there. Other overviews include William Phillips' Conquest of Kansas (written by one of the participants at the time, as propaganda for the antislavery cause) and Robinson's The Kansas Conflict, written by a member of the same side (a friend of Phillips, in fact) decades later. The proslavery side is not as well-represented in period literature, though George Douglas Brewerton's War in Kansas leans that way. Brewerton is "funny" in a period sense. The best day to day records easily available are the archives of the Herald of Freedom (antislavery) and Squatter Sovereign (rabidly proslavery) at the Library of Congress. You can get to individual issues easiest by hitting up Calendar View

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