Vince-Proe, Daphne, author
McGraw-Hill, 1975
Buku Teks
Lofts, Brian
The English Language Book Society, 1970
Buku Teks
Bold, Harold Charles, 1909-, author
Harper & Row, 1987
Buku Teks
Tivy, Joy, author
Longman Scientific & Technical, 1993
Buku Teks
Esau, Katherine, author
John Wiley & Sons, 1977
Buku Teks