WHO
Geneva, WHO, 1996, 1996
Buku Teks
Valanis, Barbara, author
Connecticut Appleton & Lange, 1999
Buku Teks
by Ministry of Health Republic of Indonesia
Departemen Kesehatan, 1990
Buku Teks
Schneiderman, Lawrence J., author
Addison-Wesley, 1981
Buku Teks
Kotler, Philip, author
Prentice-Hall, 1987
Buku Teks