Lax, David A.
The Free Press, 1986
Buku Teks
Faguet, Dmitri, author
John Wiley & Sons, 2003
Buku Teks
Thomsett, Michael C., author
American Management Association, 2011
eBooks
Hiltrop, Jean Marie
Prentice-Hall, 1995
Buku Teks
Thompson, Leigh L., author
Pearson, 2015
Buku Teks