McKernan, Susan, author
Allen & Unwin, 1989
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1957
Buku Teks
Davidson, Jamie S., author
Cambridge University Press, 2018
Buku Teks
Bryson, Bill, author
Broadway Books, 2000
Buku Teks
Deloitte Touche Tohmatso limited
Deloitte Touche Tohmatso limited, 2010
Buku Referensi