Millar, T.B., author
Georgian House, 1972
Buku Teks
Watt, Alan, author
Cambridge at The University Press, 1967
Buku Teks
Andrerson, James E., author
Addison-Wesley, 1970
Buku Teks
Penguin Books , 1970
Buku Teks
edited by Coral Bell
Australian National University Press, 1980
Buku Teks