Adam, J.H., author
York Press, 1989
Buku Referensi
Sharma, R.C., author
Tata McGraw-Hill, 2002
Buku Teks
Lesikar, Raymond Vincent, author
McGraw-Hill/Irwin , 2002
Buku Teks
Wilson, Kevin, 1958- , author
American Management Association;, 2010
eBooks
Hill, Charles W.L., author
Salemba Empat, 2014
Buku Teks