Barrett, John
Allen & Unwin, 1995
Buku Teks
edited by Stephen R. Graubard
Angus and Robertson, 1985
Buku Teks
Cambridge, Ada. 1844-1926
New South Wales University Press, 1989
Buku Teks
Cheshire, 1974
Buku Teks
Robertson, John
William Heinemann, 1981
Buku Teks