McIntyre, Lisa J., author
McGraw-Hill, 2008
Buku Teks
editor, J. Dwi Narwoko, Bagong Suyanto
Kencana, 2010
Buku Teks
Maarif Institute, 2009
Majalah, Jurnal, Buletin
Wila Huky
Usaha Nasional, 1982
Buku Teks
Tischler, Henry L.
Wadsworth and Cengage Learning, 2014
Buku Teks