Botkin, Daniel B.
John Wiley & Sons, 1995
Buku Teks
Botkin, Daniel B.
John Wiley & Sons, 2000
Buku Teks
Botkin, Daniel B.
John Wiley & Sons, 2003
Buku Teks
Garte, Seymour
American Management Association, 2008
eBooks
Brown, Lester R.
Erlangga, 1982
Buku Teks