(en) Karen Collins, Game sound : an introduction to the history, theory, and practice of video game music and sound design, Cambridge, Mass., MIT Press, , 200 p. (ISBN978-0-262-03378-7, lire en ligne), p. 56-57.
Michael Sweet, Writing Interactive Music for Video Games : A Composer's Guide Game Design, Addison-Wesley Professional, , 512 p. (ISBN978-0-13-356351-1, lire en ligne), p. 99.