Clegg, H. A., author
Clarendon Press, 1964
Buku Teks
Sufrin, Sidney C.
Syracuse University, 1964
Buku Teks
Waters, Frank, author
University Of Queensland Press, 1978
Buku Teks
Australian Institute of Political Science; [edited by John Wilkes]
Angus and Robertson, 1972
Buku Teks
Schutte, James E
Hogrefe and Huger, 1995
Buku Teks