Berreman, Gerald D.
Centre for Strategic and International Studies, [1972]
Buku Teks
Nadel, S.F. (Siegfried Frederick)
Cohen & West, 1969
Buku Teks
Nadel, S.F. (Siegfried Frederick)
The Free Press of Glencoe, 1964
Buku Teks
Allyn and Bacon, 1991
Buku Teks
Nadel, S.F. (Siegfried Frederick)
Cohen & West, 1969
Buku Teks