Driessen, F. C
Mouton, 1965
Buku Teks SO
St. Martin's Press, 1978
Buku Teks SO
Hacker, Diana
Bedford Books of St. Martin?s Press, 1995
Buku Teks SO
edited by Barry Turner
Macmillan and The Free Press, 1992
Buku Referensi
edited by Barry Turner
Macmillan, 1992
Buku Referensi