Suharto Ladjide, author
Tni al and technological challenges for the 21 st century
Seskoal Press, 2019
 Artikel Jurnal
The 21 st century is here, and uses 19th- century technology Michael schuyler
 Artikel Jurnal
The Use of airspace and outer space for all mankind in the 21 st century
edited by Cheng Chia-Jui
Kluwer Law International, 1995
 Buku Teks
Hein, Eleanor C., author
Nursing issues in the 21 st century: perspective from the literature
Lippincott , 2001
 Buku Teks
Herr, Edwin L.
Counseling in a dynamic society: contexts and practices for the 21 st century
American counseling Association, 1998
 Buku Teks
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