Mann, Thomas
Oxford University Press, 2005
Buku Teks
Lawal, Ibironke O.
Chandos Publishing, 2009
Buku Teks
Kennedy, James H.
Pierian Press, 1984
Buku Referensi
Weiner, E.S.C., compiler
Clarendon Press, 1993
Buku Referensi
Peter Pierce, Rosemary Hunter, editor
Oxford Univeristy Press, 1987
Buku Referensi