Karpinski, Andrzej, author
Twenty years of Poland's economic development 1944-1964
Polonia Publishing House, 1964
 Buku Teks
Korea's 50 years of economic development
 Artikel Jurnal
Drucker, Peter Ferdinand, 1909-2005, author
America's next twenty years
Harper & Brothers, 1957
 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
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