http://www.usingenglish.com/glossary/question-types.html

definitions

http://ciir.cs.umass.edu/pubfiles/ir-323.pdf
Analysis of Statistical Question Classification for
Fact-based Questions
Donald Metzler and W. Bruce Croft
University of Massachusetts, Amherst

IR-323: (2003) Metzler, D. and Croft, W.B., "Analysis of Statistical
Question Classification for fact-based Questions"
Information Retrieval.



                       Any questions left?
       Review of Ginzburg & Sag's Interrogative
J. Linguistics 40 (2004), 131-148. f 2004 Cambridge University Press
DOI : 10.1017/S0022226703002354 Printed in the United Kingdom

                                               1
                       Investigations.
Jonathan Ginzburg and Ivan Sag, Interrogative Investigations,
CSLI
Lecture Notes 123. Stanford, California: CSLI publications,
2000. Pp.
xii
+ 449.
http://linguistics.buffalo.edu/people/faculty/koenig/papers/review-gs-final.pdf