edited by Bill Cope
Chandos Publishing, 2006
Buku Teks
Mandell, Laura, author
Wiley Blackwell, 2015
Buku Teks
Edited by Bill Cope
Chandos Publshing, 2006
Buku Teks
edited by George Thomas Kurian, Graham T.T. Molitor
Macmillan Library Reference USA, 1996
Buku Referensi
Minkin, Barry Howard, author
Macmillan, 1995
Buku Teks