Cambridge University Press, 2008
eBooks
Oakes, Michael P., author
Edinburgh University Press, 1998
Buku Teks
Woods, Anthony
Cambridge University Press, 1986
Buku Teks
Baclawski, Kenneth, author
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Gazdar, Gerald, author
Addison-Wesley, 1989
Buku Teks