Badan Pusat Statistik, 2008
Buku Referensi
edited by Benjamin D. Paul
Russel Sage Foundation,
Buku Teks SO
World Health Organization
World Health Organization, 1997
Buku Teks
Unun Khamida Qodarina
Universitas Indonesia, 2014
UI - Skripsi Membership
Ministry of Helath IHRD, 1998
Buku Teks SO