Beer, Stafford
John Wiley & Sons, 1981
Buku Teks
Beer, Stafford
English University Press, 1973
Buku Teks
Tono Purwantoro
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2002
UI - Tesis (Membership)
edited by Charles R. Dechert
A. Clarion book, 1966
Buku Teks
Ashby, W. Ross
Chapman and Hall , 1973
Buku Teks