Schulz, Rockwell
McGraw-Hill, 1983
Buku Teks
Deegan, Arthur X.
Aspen Publishing, 1982
Buku Teks
Nydia Andriani
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2012
UI - Skripsi Open
World Health Organization, Regional Office for Europe, 1985
Buku Teks SO
Berman, Howard J.
University of Michigan Press, 1982
Buku Teks