Valentine, Christine
Bereavement narratives : continuing bonds in the twenty-first century
Routledge, 2008
 Buku Teks
Bruyn, Severyn T.
A Civil Economy: Transforming the Market in the Twenty-First Century
The University of Michigan Press, 2000
 Buku Teks
Heye, Dennie
Characteristics of the successful twenty-first century information professional
Chandos Publishing, 2006
 Buku Teks
Civilian protection in the twenty-first century : governance and responsibility in a fragmented world
edited by Cecilia Jacob and Alistair D.B. Cook
Oxford University Press, 2016
 Buku Teks
Stachokas, George
After the book : information services for the twenty-first century
Chandos, 2014
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