This page will have links to good introductory readings, suitable for classroom use.
In addition, we have summarized many of the recent books on partisanship and civility:
CLICK HERE FOR CIVIL POLITICS BOOK SUMMARIES
Misc. essays about civility:
A christian perspective on civility (From Christianity Today) [haidt, jan 2012]
I Can't Believe my Best Friend is a Republican, in Salon. Essay about a cross-partisan friendship that shows how helpful it is to like someone first, in order to be able to listen to them, and then how helpful it can be to your own thinking to be able to listen to someone on the other side.