Litterer, Joseph August, 1926-, author
John Wiley & Sons, 1973
Buku Teks
Pfifner, John M., author
Prentice-Hall, 1960
Buku Teks
Barney, Jay B.
Houghton Miffiln, 1992
Buku Teks
Jay M. Shafritz, J. Steven Ott, editor
Harcourt College, 2001
Buku Teks
edited by Jay M. Shafritz, J. Steven Ott
Wadsworth, 2005
Buku Teks