Wimar Witoelar
No regrets : reflection of a presidential spokesman
Equinox Publishing (Asia) PTE, 2002
 Buku Teks
Steel, Danielle
Kaleidoscope / Danielle Steel and Daddy
Dell Pub, 1987
 Buku Teks
Barrow, John D.
Impossibility : the limits of science and the science of limits
Oxford University Press , 1998
 Buku Teks
Daddy's roommate vs.Alfie's home: round two
 Artikel Jurnal
Punishment, excuses and moral development / Edited by Henry Benedict Tam
Avebury , 1996
 Buku Teks