Here are the main non-web sources used for this timeline.

Cassara, Ernest, ed.  Universalism in America.  Boston: Skinner House Books.  1997.

Parke, David B, ed.  The Epic of Unitarianism.  Boston: Skinner House Books.  1985.

Robinson, David.  The Unitarians and the Universalists.  Westport, Connecticut:  Greenwood Press.  1985.