Could Someone point be to a good summary of haskell code convention

Question

particularly indentation and under_score/camelCase/longalllowercasewords.

Answer 1

Good Haskell Style, by Dr. Ian Lynagh of Well-Typed.

Answer 2

Ian's document is good but a bit thin. I've already answered a very similar question but I added something about the case of words.

Answer 3

There's also http://github.com/tibbe/haskell-style-guide/blob/master/haskell-style.md, which comes with an accompanying haskell-style.el file for use with haskell-mode in Emacs.