Hagan, Frank E., author
Sage Publications, 2010
Buku Teks
Wright, John Paul, author
Sage , 2008
Buku Teks
Robinson, Matthew B., author
Pearson/Prentice Hall, 2004
Buku Teks
Gibbons, Don C., author
Prentice-Hall, 1992
Buku Teks
Athens, Lonnie H
Routledge, 1989
Buku Teks