Springer, 2012
eBooks
Wallace, Michael, author
American Management Association, 2011
eBooks
Douglas-Young, John, author
Parker Publishing Company, 1979
Buku Referensi
Brown, RObert Wade, editor-in-chief
McGraw-Hill, 2001
Buku Referensi
Shackelford, James F., author
CRC Press, 1995
Buku Referensi