by World Bank
Washington, D.C. World Bank 1999,
Buku Teks
Institute of Social Studies
Institute of Social Studies, 2000
Buku Teks SO
OFID (The Opec Fund for International Development, 2005
Multimedia
The Goverment Of Sleman Regency The provincce Of Yogyakarta Special Territory, 2006
Buku Referensi
Badan Pengkajian dan Penerapan Teknologi, 2009
Buku Teks SO