Potter, Pitman B.
University Of Washington Press, 1992
Buku Teks
Murdoch, John, author
Spon Press, 2000
Buku Teks
Wilson, J. F., author
Sweet & Maxwell, 1957
Buku Teks
Care, Jennifer Corrin, author
Cavendish Publishing Limited, 2001
Buku Teks
Suff, Marnah
Cavendish Publishing, 1994
Buku Teks