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