Whelan, R.F., author
Charles C. Thomas, 1967
Buku Teks
DeSousa, Maria, author
John Wiley & Sons, 1981
Buku Teks
Tricker, R.A.R., author
Pergamon Press, 1965
Buku Teks
Wheeler, James O.
Duxbury Press, 1974
Buku Teks
Edited by Sophie Chiari
Routledge, 2015
Buku Teks