There are editions of the book using ML and Java. Since Andrew Appel is involved with SML/NJ, the ML edition is most likely the original. (The ML one is also quite good.)

Commas?

Personally, I'm never a fan of punctuation first formatting styles - though I give some exception for dot (.) first method calls in fluent interfaces for C-family languages.

    someInterface
       .thatCan()
       .chain()
       .itsCalls();