Febrina Ika Shinta
1998
UI - Skripsi (Membership)
Yuyuk Pujiastuti
1990
UI - Skripsi (Membership)
Evans, B. Ifor
Penguin Books , 1948
Buku Teks
Joice Sandra Antonio
1995
UI - Skripsi (Membership)
edited by Jonathan Culpeper, Mick Short, and Peter Verdonk
Routledge, 1998
Buku Teks