Schulz, Rockwell, author
McGraw-Hill, 1976
Buku Teks
Schulz, Rockwell, author
McGraw-Hill, 1983
Buku Teks
Deegan, Arthur X., author
Aspen Systems Corp., 1982
Buku Teks
Nydia Andriani, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2012
UI - Skripsi (Open)
World Health Organization, Regional Office for Europe, 1985
Buku Teks