Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Heinemann Profesional , 1990
Buku Teks
Cambridge University Press, 2015
eBooks
Annan, Kofi A., author
United Nations, 1998
Buku Teks
Chambers, Iain, author
Routledge, 2001
Buku Teks
Enriquez, Juan, author
Crown Business, 2001
Buku Teks