Raffman, Diana
Cambridge The MIT Press 1993
Buku Teks
Underhill, Nic, author
Cambridge University Press, 1993
Buku Teks
Christopher Titford edited
Gunter Narr, 1985
Buku Teks
Hughes, Arthur
Cambridge University Press, 1994
Buku Teks
Waterman, John T.
Munchen Max Hueber 1966
Buku Teks