Foster, Janet
Routledge, 1990
Buku Teks
Prima Buana Internusa,
Majalah, Jurnal, Buletin
Towers, Graham
UCL Press, 1995
Buku Teks SO
Agger, Ben
Falmer Press, 1992
Buku Teks SO
edited by Antony Easthope, Kate McGowan
University of Toronto Press, 1994
Buku Teks SO