Muhammad Shalih al-Munajjid
Larangan Allah yang sering dilanggar = Muharramat (prohibitions that are taken too lightly)
Cakrawala Publishing, 2005
 Buku Teks SO
Franz Magnis-Suseno
Kuasa dan moral
Gramedia Pustaka Utama, 2000
 Buku Teks SO
Tiles, J.E.
Moral measures: an introduction to ethics west and east
Routledge, 2000
 Buku Teks SO
Smith, Michael
Ethics and the a priority: selected essays on moral psychology and meta-ethics
Cambridge University Press , 2004
 Buku Teks SO
Goldman, Alan H.
Moral knowledge
Routledge, 1990
 Buku Teks SO