Cox, C. Barry, author
Blackwell, 1995
Buku Teks
Cox, C. Barry, author
Blackwell, [Date of publication not identified]
Buku Teks
Mielke, H.W.
Unwin Hyman, 1988
Buku Teks
edited by A.A. Myers and P.S. Giller
Chapman & Hall, 1988
Buku Teks
Humphries, Christopher J., author
Clarendon Press, 1986
Buku Teks