Crisp, L.F. (Leslie Finlay)
Yale University Press, 1949
Buku Teks
Solomon, David Harris
Thomas Nelson, 1973
Buku Teks
Solomon, David Harris
Thomas Nelson, 1978
Buku Teks
Kroef, Justus M. van der
Yayasan Paritrana, 1973
Buku Teks
Australian Institute of Political Science; [edited by John Wilkes]
Angus and Robertson, 1972
Buku Teks