Beatty, Richard H.
John Wiley & Sons, 1986
Buku Teks
Bennett, Scott, author
American Management Association, 2005
eBooks
Stewart, Charles J., author
Salemba Humanika, 2012
Buku Teks
Bostwick, Burdette E., author
John Wiley & Sons, 1981
Buku Teks
Poundstone, William, author
Little, Brown, 2012
Buku Teks