Ministry of Health RI, 2015
Buku Teks
Endro Utomo Notodisuryo
Jakarta: Energy conservation workshop, 1996,
Buku Referensi
Blake, Robert R., author
Dow Jones-Irwin, 1980
Buku Teks
Service, Elman R. (Elman Rogers), 1915-1996, author
Harper & Brothers, 1958
Buku Teks
Forthofer, Ron N.
Lifetime Learning Publications, 1981
Buku Teks