The World of Ideas: essays for study
edited by Michael W. Alssid, William Kenney
Holt, Rinehart and Winston, 1964
 Buku Teks
The world of ideas: essays for study
edited by Michael W. Alssid and William Kenney
Holt, Rinehart and Winston, 1966
 Buku Teks
London, Kurt, editor
Backgrounds of conflict Ideas and Forms in World Politics
Macmillan, 1947
 Buku Teks
Ward, Barbara
Five ideas that change the world / Barbara Ward
W.W. Norton & Company, 1959
 Buku Teks
Ingpen, Robert
Encyclopedia of ideas that changed the world : the greatest discoveries and inventions of human history
Dragon's World, 1993
 Buku Referensi