Cox, C. Barry
Blackwell, 1995
Buku Teks
Cox, C. Barry
Blackwell, [Date of publication not identified]
Buku Teks
edited by A.A. Myers and P.S. Giller
Chapman & Hall, 1988
Buku Teks
Huggett, Richard John
Routledge, 1998
Buku Referensi
Brown, James H.
Mosby, 1983
Buku Teks