edited by S. Encel ... [et.al.]
Longman Cheshire, 1984
Buku Teks
Bennett, Raymond
M.M & B. Book, 1989
Buku Teks
Stephen Johnston... [et al.]
Harper Educational, 1995
Buku Teks
Edgar, Donald E., editor
Prentice-Hall, 1980
Buku Teks
Birrell, Robert
Longman Cheshire, 1987
Buku Teks