Yablonsky, Lewis
Juvenile delinquency into the 21st century
Wadsworth, 2000
Buku Teks
Nugent William R.
Practice Evaluation for the 21st Century
Thomson Learning, 2001
Buku Teks
Che, Yuming
Chinese enterprises in the 21st century
Foreign Language Press, 2008
Buku Teks
21st century sustainable homes
Images Publishing Group, 2011
Buku Referensi
Smith, Mitchell Oakley
Art/Fashion in the 21st Century
Thames & Hudson, 2013
Buku Teks