Friis, Robert H., author
Occupational health and safety for the 21st century
Jones &​ Bartlett Learning, 2016
 Buku Teks
Gesker, Ronald D., author
Media planning and buying in the 21st century
2020:Marketing Communications LLC, 2015
 Buku Teks
Human geography : issues for 21st century
Peter Daniels [and others]
Prentice-Hall, 2001
 Buku Teks
Korea's strategic environment in the 21st century
 Artikel Jurnal
Kipfer, Barbara Ann, author
21st century synonym and antonym finder
The Philip Lief Group, 1995
 Buku Referensi
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