Aren't most of those studentdoc discussions emotional, personal and often hostile? I'm not sure that is the best source for an objective look at the issue.
I know www.aana.com
has good descriptions of CRNA practice. I'm sure the ASA website has similar position statements. I think those would be more helpful to you.
Watchful Care by Bankert is a great source on the history of the evolution of nurse anesthesia practice. It is a book, but selected readings out of it would be useful, if this is a paper of any length and/or substance.
Advanced practice nursing, an integrated approach, by Ann Hamric is a great textbook that probably covers this.