SARS – infectious disease of 21st century
Medical Journal of Indonesia, 14 (1) January March 2005: 59-63, 2005
 Artikel Jurnal
Assessment and teaching of 21st century skills
editor, Patrick Griffin, Barry McGaw, Esther Care
Springer, 2012
 eBooks
Managing public libraries in the 21st century
Edited by Pat Woodrum
The Haworth Press, 1989
 Buku Teks
21st Century Criminology: A Reference Handbook
Sage Publications, 2009
 eBooks
Bouvier, Leon F., author
World population : challenges for the 21st century
Seven Lucks Press, 1999
 Buku Teks
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