edited by: John Halligan and Chris Paris
Longman Chesire, 1984
Buku Teks SO
Kennedy, Richard
Macmillan Publishing Co. Inc, 1982
Buku Teks
Jacaranda Press, 1975
Buku Teks SO
by George Orwell
Secker and Warburg, 1951
Buku Teks
edited by S. Encel ... [et.al.]
Longman Cheshire, 1984
Buku Teks SO