Author Addenda by Peter Hirtle
Mr. Hirtle quite usefully reviews five author addenda that are designed for authors at the point of negotiating copyright with publishers. I'm planning on using it for my classes on copyright for authors and recommend it.
"Author Addenda:An Examination of Five Alternatives" by Peter B. Hirtle
Cornell University Library
D-Lib Magazine November 2006 Volume 12 Number 11