Bander, Edward J., author
Balinger, 1978
Buku Teks
SEAMEO Regional Language Centre, 1983
Buku Referensi
The officer of Education Research and Development Ministry of National Education,
Majalah, Jurnal, Buletin
Ary, Donald
Wardsword Cengage Learning, 2010
Buku Teks
Wiersma, William, author
Pearson, 2009
Buku Teks