PBS
Pbs: American Experience: John Brown's Holy War: Pottawatomie Massacre
PBS provides information on John Brown's involvement in the Pottawatomie Massacre and the reasons behind the massacre.
Other
Kansas Cyclopedia of State History: Pottawatomie Massacre
Describes the Pottawatomie Massacre which was John Brown's plan to drive the pro-slavers out of the area. From a 1912 encyclopedia.
Independence Hall Association
U.s. History: The Pottawatomie Creek Massacre
John Brown, seeking revenge for the sack of Lawrence, Kansas, made Kansas even more bloody. Read about the Pottawatomie Massacre and its reverberations throughout Kansas.
ClassFlow
Class Flow: Trouble in Kansas
[Free Registration/Login Required] This flipchart contains information about the Kansas-Nebraska Act and the violence that followed in Kansas. It contains photographs of key figures.