Programming in Haskell (Graham Hutton) (Z-Library)

This is the second edition of the book, "Programming in Haskell" (2007) by Professor Graham Hutton. This is one of the best books to learn Haskell, and is arguably the best one there is to understand the mathematical background for Haskell's programming paradigm. It is a relatively short book that is not unnecessarily pithy, and it covers the essential core and essence of the language.