Freebody, Peter
SAGE Publications, 2003
Buku Teks
Mataram Universitas Press, {s.a.}
Majalah, Jurnal, Buletin
Universitas Press IKIP Surabaya, 1992
Majalah, Jurnal, Buletin
Wiersma, William
Allyn and Bacon , 1991
Buku Teks
Best, John W.
Prentice Hall of India, 1982
Buku Teks