Oxford Univesity Press, 1994
Buku Referensi
Blackburn, Simon, author
Oxford University Press, 2005
Buku Referensi
Allaby, Michael, editor
Oxford University Press, 1992
Buku Referensi
edited by Michael Allaby
Oxford University Press, 1992
Buku Teks
Mayhew, Susan, author
Oxford University Press, 1992
Buku Referensi