edited by Wang Gungwu, Milagros Guerrero & David G. Marr
Australian National University, 1981
Buku Teks SO
Hacker, Diana
Bedford Books of St. Martin?s Press, 1995
Buku Teks SO
Colin-Jones, Graham
Times Books International, 1995
Buku Teks
Colin-Jones, Graham
Times Books International, 1989
Buku Teks
edited by Barry Turner
Macmillan and The Free Press, 1992
Buku Referensi