Addams, Jane
Twenty years at Hull-House : with autobiographical notes / by Jane Addams
New American Library, 1961
 Buku Teks
Bryson, Bill, author
I'm a stranger here myself : notes on returning to America after twenty years away
Broadway Books, 2000
 Buku Teks
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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