The best Haskell book I have ever read. Simple and straightforward. Allows the reader to do something useful very quickly, and with enough reference for further study (read: pointers to academic papers in the theory of programming languages). Highly recommended.

Bibliographic data

   title = "Programming in Haskell",
   author = "Graham Hutton",
   publisher = "Cambridge University Press",
   year = "2007",
   isbn = "0-521-87172-7",