- Haskell Functors in Detail: An in-depth tutorial/reference about functors https://www.reddit.com/r/haskell/comments/iu6bec/haskell_functors_in_detail_an_indepth/ 4 comments haskell
- Haskell in Depth by Vitaly Bragilevsky https://www.manning.com/books/haskell-in-depth 41 comments haskell