Edmond, Martin
Westview press, 1990
Buku Teks
Lowry, Robert
St Leonards Allen & Unwin 1996
Buku Teks
MacIntosh, Malcolm
Frances Printer Pub., 1986
Buku Teks
Lowry, Robert
Allen & Unwin, 1996
Buku Teks
Department of Defence and Security Indonesia
Department of Defence and Security, 1982
Buku Teks