Artikel Jurnal
edited by Terry Nichols Clark
Sage, 1983
Buku Teks SO
Pri Hartini
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Skripsi Open
Policy Research Institute Ministry of Finance, Japan, 2008
Majalah, Jurnal, Buletin
edited by Alan J. Auerbach
MIT Press, 1997
Buku Teks SO