And for your reading pleasure, please peruse items in the first section of this resource list: http://readinglists.ucl.ac.uk/lists/C41FAE83-572B-5061-D749-27ABF6734F77.html
If you read only one thing:
Let it be: The assessment cycle: a model for learning through peer assessment –
Recommended:
Developing employability skills: peer assessment in higher education –
And watch: Dr. Heidi Andrade, Ed.D. Reflects on Self- and Peer Assessment