Merriam-Webster,
Buku Referensi
Ambassade de France en Indonesie
Enrique Indonesia, 2007
Buku Referensi
UNESCO, 1989
Buku Referensi
World Health Organization
World Health Organization, 1976
Buku Teks
Windi Pramudyawardani, author
Program Pascasarjana Universitas Indonesia, 2009
UI - Tesis Open