The current best resource for beginning with Haskell seems to be haskell-book (listed on the Github link above): http://haskellbook.com/. Chris Allen also authored this book with Julie Moronuki.
If you're looking to diversify your interests to broader CS/FP topics, you may find this link helpful: http://reinh.com/notes/posts/2014-07-25-recommended-reading-...
Other references from around here: https://news.ycombinator.com/item?id=9807066
Another book I'm considering is 'Purely Functional Data Structures' by Chris Okasaki
Another book I'm considering is 'Purely Functional Data Structures' by Chris Okasaki