dialect judgment and language development assessment

[Pam Norton]

Hi all,
    Can anyone direct me to literature that discusses
laymen's or professionals' reactions to dialects other
than their own?  I am doing background writing for my
doctoral thesis on speech/language therapists'
understanding of dialects and their reactions to
dialects other than their own while conducting
language assessments.  It would be helpful to read the
literature on first impressions, what "other
dialectness" means to people, and how people judge
others according to whether they speak their own
dialect or not.  I am a big fan of the documentary
American Tongues but I would like to read some
literature on the subject.  Of course, if there's
anything about the impact of dialect on assessment
outcome, that would be icing on the cake.  I'm happy
to compile any references and send them back to the
group.

Thanks in advance,

Pam Norton, 
Doctoral Candidate
UC Berkeley/San Francisco State
Joint Doctoral Program in Special Education