Sachs, Jeffrey D.
The end of poverty : economic possibilities for our time
Penguin Books, 2005
 Buku Teks
Ascent
National University of singapore, 2008
 Majalah, Jurnal, Buletin
Murchine, Guy
Music of the sphreses : a book about space, time and water the great adventure of our age
Boston: Houghton Mifflin, 1961
 Buku Teks
Laski, Harold J.
Reflections on the Revolution of our time
George Allen and Unwin, 1952
 Buku Teks
Laski, Harold J.
Reflections on the revolution of our time
George Allen and Unwin, 1946
 Buku Teks