Ingpen, Robert, author
Encyclopedia of world events : eighty turning points in history
Dragon's World, 1995
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Chen, Chaomei, author
Turning points : the nature of creativity
Springer-Verlag, 2011
 eBooks
The nursing profession : turning points
edited by Norma L. Chaska
Mosby , 1990
 Buku Teks SO
Ingpen, Robert, author
Encyclopedia of ideas that changed the world : the greatest discoveries and inventions of human history
Dragon's World, 1993
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An encyclopedia of world history : ancient, medieval, and modern chronologically arranged
compiled and edited by William L. Langer
Houghton Mifflin, 1968
 Buku Referensi
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