Wilkes, Angela
Passport Books, [Date of publication not identified]
Buku Teks SO
Coggle, Paul
Teach Youeself Books, 1991
Buku Teks SO
Bladon, Rachel
Passport Books, [Date of publication not identified]
Buku Teks SO
McKeane, Alasdair
Longman, 1994
Buku Teks SO
Coggle, Paul
Kesaint Blanc, 2011
Buku Teks SO