Dong-Kyun Park, author
ESCAP, 2017
Artikel Jurnal
Hanover Pub.,, 1981
Buku Referensi
Burnard, Philip, author
Chapman&Hall,, 1995
Buku Referensi
Susiana Nugraha, author
Universitas Indonesia, 2017
Artikel Jurnal
World Health Organization
World Health Organization, 1990
Buku Teks