Gearge Allen & Unwin, 1962
Buku Teks
Behrman, Jack N., author
Prentice-Hall, 1970
Buku Teks
Suryani Eka Wijaya, author
PT Penjaminan Infrastruktur Indonesia, 2021
Artikel Jurnal
World Haelth Organization
World Health Organization, 1992
Buku Teks
Chambers, Iain, author
Routledge, 1990
Buku Teks