Peer, Willie van, author
Routledge, 1991
Buku Teks
U.S.A : Bowling Green U.S.A. Philosophy Documentation Center
Majalah, Jurnal, Buletin
Azhim, Ali Abdul, author
Rosda Offset, 1989
Buku Teks
Rousseau
Paris Hachette Livre 1995
Buku Teks
Munchen Carl Hanser Verlag 1974
Buku Teks