New York : William Marsh Rice University
Majalah, Jurnal, Buletin
edited by M.J. Toswell and E.M. Tyler
Routledge, 1996
Buku Referensi
Swets & Zeitlinger B.V., 1994
Majalah, Jurnal, Buletin
Blamires, Harry
Routledge, 1994
Buku Teks
Turville-Petre, Thorlac
Blackwell Publishing, 2007
Buku Teks