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 Bankole Osita Awuzie, Peter McDermott
Springer Nature, 2019
eBooks
edited by Charles R. Dechert
A. Clarion book, 1966
Buku Teks SO