Harris, Donald
Cambridge University Press, 2005
Buku Teks
Duxbury, Robert
Thomson Reuters, 2011
Buku Teks
Robert Upex
Sweet & Maxwell, 1995
Buku Teks
selected and edited by Steven J. Burton, Melvin A. Eisenberg
West Publishing, 1996
Buku Teks
Universitas Indonesia, 2011
UI - Skripsi (Open)