These are the works in which I pulled most of my information.
Brooks, Jeff. "Minimalist Tutoring: Making the Student Do All the Work". The St. Martin's Sourcebook for Writing Tutors. Ed. Christina Murphy and Steve Sherwood. St. Martin's Press: New York. 1995.
Clark, Irene Lurkis. "Collaboration and Ethics in Writing Center Pedagogy". The St Martin's Sourcebook for Writing Tutors. Ed. Christina Murphy and Steve Sherwood. St. Martin's Press: New York. 1995.
Flower, Linda. Problem Solving Strategies for Writing. 2nd ed. Harcourt Bruce Jovanovich Inc.: Washington D.C. 1985.
Holt, Mara. "The Value of Written Peer Criticism". College Composition and Communication. October 1992. http://www.richmond.edu/~writing/restricted/holt.pdf. 1 Sept 1997.
Meyers, Emily and Louise Z. Smith. The Practical Tutor. Oxford University Press: New York. 1987.
Ryan, Leigh. The Bedford Guide for Writing Tutors. Bedford Books: Boston. 1998.
Smith, Summer. "The Genre of the End Comment" College Composition and Communication. May 1997. http://www.richmond.edu/~writing/restricted/smith.pdf. 22 Sept 1997.
Straub, Richard. "The Concept of Control in Teacher Response: Defining the Variety of 'Directive' and 'Facilitative' Commentary". College Composition and Communication. May 1996. http://www.richmond.edu/~writing/restricted/straub.pdf. 22 Sept 1997.
I also would like to thank Dr. Essid and my classmates for their help and feedback.
Other Sources that may help you learn more about commentary:
Readings from the Fall Semester of English 376.