Jones, Howard Palfrey
Indonesia: the possible dream
Ayu Mas, 1977
 Buku Teks
Burnheim, John
is Democracy possible The alternative to electonal politics
University of California Press, 1985
 Buku Teks
Gomperts, Amrit
A possible location of gajah mada's madakaripura
Faculty of Humanities University of Indonesia, 2006
 Artikel Jurnal
Ouspensky, P.D.
The Psychology of man's possible evolution/ F.D. Quespenky
Hodder and Stoughton, 1957
 Buku Teks
Santos, Filipe Duarte
Humans on earth : from origins to possible futures
Springer, 2012
 eBooks