Sorenson, Ritch, author
Prentice-Hall, 2001
Buku Referensi
Daniels, Lawrence J., 1942- , author
[American Management Association;, ], 2013
eBooks
edited by Walter Sterling Surrey and Crawford Shaw
American Law Institute, 1963
Buku Teks
Halford, D.R.C., author
Pan Books, 1971
Buku Teks
Sadgrove, Kit, author
Routledge, 2015
eBooks