Rothenberg, Lawrence S., author
Cambridge University Press, 1992
Buku Teks
Niemi, Richard G., author
Jossey-Bass, 1974
Buku Teks
Merriam, Robert E. (Robert Edward), 1918-, author
Harper & Brothers, 1957
Buku Teks
Boileau, Julian M., author
Yayasan Proklamasi, Centre for Strategic and International Studies, 1983
Buku Teks
Pethybridge, Roger
Frederick A. Praeger, 1962
Buku Teks