[publisher not identified], [date of publication not identified]
Buku Referensi
Speaight, R.
Arthur Barker, 1954
Buku Teks SO
Salomon, Pierre
Paris Hatier-Boivin 1953
Buku Teks
edited by R.L. Brett
Longmans, Green, 1956
Buku Teks SO
Farmer, Albert John
British Council by Longmans, Green, 1966
Buku Teks SO