Lawson, Joseph W.R., II, author
American Management Association, 1998
eBooks
edited by Brenda Rapp
Taylor and Francis, 2001
Buku Teks
Herbert, Jean, author
Librairie de L'Universite, 1952
Buku Referensi
Eberhart, George M., author
[American Library association, American Library association], 2006
eBooks
Mackenizie, John
Illinois: Dow Jones-Irwin, 1989
Buku Teks