Wilson, Kevin, author
American Management Association, 2010
eBooks
James, C.V.
Prentice-Hall, 1992
Buku Teks
Guffey, Mary Ellen, author
PWS Publishing, 1991
Buku Teks
Guffey, Mary Ellen, author
PWS-Kent, 1988
Buku Teks
by Geraldine Henze
Richard D. Irwin, 1984
Buku Teks