Oatley, Thomas, author
Pearson, 2012
Buku Teks
Ohmae, Kenichi, author
Harper Business, 1999
Buku Teks
Callinicos, Alex, author
Eduka, 2008
Buku Teks
Richardson, Harry W., author
Program Perencanaan Nasional, 1975
Buku Teks
Herod, Andrew, author
Willey Black well, 2009
Buku Teks