Hutton, Wendy
Opus Publications Sdn Bhd, 2007
Buku Referensi
penyusun, Non Martis... [and others]
Pusat Bahasa. Depdiknas, 2002
Buku Teks SO
King, Victor T.
Blackwell, 1993
Buku Teks
King, Victor T.
Blackwell, 1993
Buku Teks SO
Mackinnon, John Ramsay
[publisher not identified], [date of publication not identified]
Buku Teks SO