Spens, Michael
Academic Edition, 1995
Buku Teks SO
Reid, D.A.G.
London: Longman, 1966
Buku Teks
Seeley, Ivor H.
Macmillan, 1995
Buku Teks SO
McKay, W.B.
The English Language Book Society and Longman, 1971
Buku Teks SO
McKay, W.B.
The English Language Book Society and Longman, 1971
Buku Teks SO