Price, Alan
International Thomson Business Press , 1997
Buku Teks
Stone, Raymond J., author
John Wiley & Sons, 1995
Buku Teks
Armstrong, Michael, author
Crest Publishing House, 1999
Buku Teks
McGraw-Hill, Irwin, 2003
Buku Teks
Bohlander, George W., author
South Western Cengage Learning, 2013
Buku Teks