Although we have tried to look into RESTful web services in a way that one gets practical knowledge with the examples, here are some other interesting resources.
Dissertation of Roy Fielding in which he introduced REST:
http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm
A group discussion with Roy Fielding's response:
https://groups.yahoo.com/neo/groups/rest-discuss/conversations/topics/6735
This is an interesting thread at stackoverflow.com regarding REST versus SOAP:
http://stackoverflow.com/questions/19884295/soap-vs-rest-differences
Roy Fielding talking about REST :
https://www.youtube.com/watch?v=w5j2KwzzB-0
A different way to look at REST: