Warwick, E.J., author
Gadjah Mada University Press, 1983
Buku Teks
Belschner, H.G., author
Angus & Robertson Pub. , 1984
Buku Teks
Artikel Jurnal
Iowa State College Press, 1959
Buku Teks
Deandra Arifianti Wisnuputri, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2018
UI - Skripsi (Membership)