Matthews, Joseph R., author
Libraries Unlimited, 2005
Buku Teks
Thompson, Leigh L., author
Pearson - Prentice Hall, 2008
Buku Teks
Taylor, James, author
American Management Association, 2006
eBooks
Thompson, Leigh L., author
Pearson/Prentice Hall, 2004
Buku Teks
Sweet, Donald H., author
Addison-Wesley, 1975
Buku Teks