Hensderson, Gloria Mason, author
Pearson , 2006
Buku Teks
Hensderson, Gloria Mason
Longman , 2003
Buku Teks
Kennedy, X.J., author
Harper Collins College, 1991
Buku Teks
Kennedy, X.J., author
Pearson, 2016
Buku Teks SO
Kennedy, X.J., author
Pearson Longman, 2005
Buku Referensi