Denhardt, Robert B., author
Cengage Learning, 2015
Buku Teks
Denhardt, Robert B., author
Harcourt College, 1999
Buku Teks
Gaus, John M., author
University of Alabama Press, 1055
Buku Teks
Shafritz, Jay M., author
Wadsworth/Thompson Learning, 2004
Buku Teks
Fesler, James W. (James William), 1911-2005, author
Prentice-Hall, 1980
Buku Teks