World Health Organization, 1980
Buku Teks
Imam Subekti, author
Faculty of Medicine University of Indonesia, 2018
Artikel Jurnal
New York : Macmillan, 1993,
Buku Referensi
Hahn, Dale B., author
McGraw-Hill, 2002
Buku Teks
Gandhi, M.K., 1869-1948, author
Navajivan, 1948
Buku Teks