So he changed the text as time went on, since the 1998 version doesn't reference Khan Academy. Though the "(1998)" might still be justified if the changes are minor.
I see a reference to Khan Academy, but not Go?
> Learn at least a half dozen programming languages. Include one language that emphasizes class abstractions (like Java or C++), one that emphasizes functional abstraction (like Lisp or ML or Haskell), one that supports syntactic abstraction (like Lisp), one that supports declarative specifications (like Prolog or C++ templates), and one that emphasizes parallelism (like Clojure or Go).