Oxford University Press, 1996
Buku Referensi
Cowie, A.P., author
Oxford University Press, 1993
Buku Referensi
edited by Sally Wehmeier
Oxford University Press, 1993
Buku Referensi
CHalker, Sylvia, author
Clarendon Press, 1994
Buku Referensi
Clarendon Press, 1990
Buku Referensi