Crelyn, R.J.
"Chichester: John Wiley & Sons, 1990",
Buku Teks
Organisation for Economic Co-operation and Development, 1975
Buku Teks
Universitas Indonesia, 2006
UI - Skripsi (Membership)
Sigit Nugroho, author
Universitas Indonesia, 2008
UI - Tesis (Open)
Jakarta : Tani Merdeka
Majalah, Jurnal, Buletin