As attribution is what I am working on, I have collected extensive bibliography concerning annotation and extraction of attribution of quotes and opinions. I have made it available here:
http://homepages.inf.ed.ac.uk/s1052974/otherresources.php
You will find several papers dealing with the attribution of authors of quotations. There is also a list of existing corpora annotated with attribution.
Cheers, Silvia
-- Silvia Pareti http://homepages.inf.ed.ac.uk/s1052974/ Institute for Language, Cognition and Computation School of Informatics, The University of Edinburgh
Informatics Forum (room 3.38) 10 Crichton Street EH8 9AB, Edinburgh, UK Phone: +44(0)131 650 4418
-- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.