George Allen & Unwin Ltd, 1981
Buku Teks
Atkins, Ruth, author
John Wiley & Sons, 1980
Buku Teks
Spann, R. N.
V.C.N. Blight, 1973
Buku Teks
Greenwood, Gordon, 1913-1986, author
University of Queensland, 1976
Buku Teks
Mayer, David Y.
Dellasta, 1988
Buku Teks