Lynch, Christopher, author
Quintessence Publishing Co.Ltd., 2008
Buku Teks
Woods, Peter, author
Routledge, 1999
Koleksi Publik
Ahuja, Hira N., author
John Wiley & Sons, 1980
Buku Teks
by Curtis E. Tate Jr. ... [and others]
Business Publication, 1982
Buku Teks
Dale, Margaret, author
Crest Publishing House, 2001
Buku Teks