edited by William Cummings
KITLV Press , 2010
Buku Teks
New York : The American Council on the Teaching of Foreign Language Inc
Majalah, Jurnal, Buletin
Buku Teks
Sage Publications, Inc, 2006
Majalah, Jurnal, Buletin
Sage Publications, Inc, 2005
Majalah, Jurnal, Buletin