[Fakultas Teknik UI, VTT Technical Research Centre of Finland], 2011
Artikel Jurnal
Pekka Leviäkangas
Faculty of Engineering, Universitas Indonesia, 2011
Artikel Jurnal
Buchanan, James M.
Liberty Fund, Inc., 2001
Buku Referensi
Marthin Hadi Juliansah
Universitas Indonesia, 2010
UI - Tesis Open
Organisation for Economic Co-operation and Development, 1974
Buku Teks