Verschuur, Gerrit L.
Hidden attraction : the history and mistery of magnetism
Oxford University Press, 1993
 Buku Teks SO
Cohen, Martin
Philosophical tales: being an alternative history revealing the characters, the plots, and the hidden scenes that make up the true story of philosophy
Blackwell Publishing, 2008
 Buku Teks SO
Zionism: instrument of imperialist reaction. Soviet opinion on events in the Middle East and the adventures of international Zionism, February - March, 1970.
Novosti press , 1970
 Buku Teks SO
Roy, Gabrielle
Hidden mountain
McClelland and Steward, 1975
 Koleksi Publik
Capra, Fritjof
The hidden connections
Harper Collins, 2002
 Buku Teks