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
Turville-Petre, Thorlac
Blackwell Publishing, 2007
Buku Teks
Otis, William Bradley
Barnes & Noble, 1939
Koleksi Publik