Sellers, Leslie, author
Pergamon Press , 1985
Buku Teks
Butcher, Judith, author
Percetakan Dewan Bahasa dan Pustaka, 1989
Buku Teks
Sharpe, Leslie T., author
Camberidge University Press , 1994
Buku Teks
Baskette, Floyd K., author
Macmillan, 1982
Buku Teks
Butcher, Judith, author
Balai Pustaka, 1988
Buku Referensi