Korea : opening a communicative space between Korea and the world
Yoo Jin-hwan Korean Culture and Information Services,
 Majalah, Jurnal, Buletin
Shapiro, Stephen M.
24/7 Innovation
McGraw-Hill, 2001
 Buku Teks SO
24/7 innovation
 Buku Teks
Schachter, Oscar, 1915-
Sharing the world's resources
Columbia University Press, 1977
 Buku Teks
World resources : a guide to the global environment
Allen L. Hammond [and others]
Oxford University Press , 1996
 Buku Teks