Stephen Johnston... [et al.]
Harper Educational, 1995
Buku Teks
Bennett, Raymond
M.M & B. Book, 1989
Buku Teks
edited by S. Encel ... [et.al.]
Longman Cheshire, 1984
Buku Teks
Cambridge University Press , 1989
Buku Teks
edited by Peter Collins and David Blair
University of Queensland Press, 1989
Buku Teks