Shaplen, Robert, author
The lost revolution: the story of twenty years of neglected opportunities in Vietnam and of America's failure foster democracy there
Harper & Row, 1965
 Buku Teks
Davidson, Jamie S., author
Indonesia: twenty years of democracy
Cambridge University Press, 2018
 Buku Teks
Celebrating twenty years with Deloitte in Indonesia
Deloitte Touche Tohmatso limited
Deloitte Touche Tohmatso limited, 2010
 Buku Referensi
Ide Anak Agung Gde Agung, 1921-1999, author
Twenty years Indonesia foreign policy 1945-1965
Mouton, 1973.
 Buku Teks
Karpinski, Andrzej, author
Twenty years of Poland's economic development 1944-1964
Polonia Publishing House, 1964
 Buku Teks
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