Maarif Institute, 2009
Majalah, Jurnal, Buletin
Wila Huky
Usaha Nasional, 1982
Buku Teks
Tischler, Henry L.
Wadsworth and Cengage Learning, 2014
Buku Teks
Brinkerhoff, David B., author
Wadsworth, Cengage Learning, 2014
Buku Teks
Macionis, John J., author
Prentice-Hall, 2008
Buku Teks