Badan Pusat Statistik, 2006
Buku Referensi
McKenney, James L.
Harvard Business School Press, 1995
Buku Teks
Dagron, Alfonso Gumucio
The Rockefeller Foundation, 2001
Buku Teks
Badan Pusat Statistik, 2007
Buku Referensi
Maxensius Tri Sambodo
[Publisher not identified], 2012
Artikel Jurnal