[Haskell-beginners] What book is being referred to: "... in SPJs beautiful code chapter ..."

[Costello, Roger L.]

Hi Folks,

I saw this mention [1]:

    I like the terminology in SPJs beautiful code chapter. 
    He talks about IO *actions* and how IO actions can 
    be glued together into larger IO actions, and that main 
    is then an IO action in itself.

Do you know what book is being referred to?

/Roger

[1] A comment by Sebastian Sylvan in: http://book.realworldhaskell.org/read/io.html