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UI - Tesis (Open)
Spindler, J. Andrew
Brookings Institution, 1984
Buku Teks
Story, Richard, 1913-
Greenwood Press, 1976
Buku Teks
Crowley, James B., author
Princeton University Press, 1966
Buku Teks
Conroy, Hilary
University of California Press, 1953
Buku Teks