Peacock, Janet L., auhtor
Oxford University Press, 2007
Buku Teks
Harris, Lesley Ellen, author
American Management Association, 2009
eBooks
Haworth Press, 1995
Buku Referensi
Does Sampoerno, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 1993
UI - Laporan Penelitian
Evans, G.O., author
Taylor and Francis, 2009
Buku Teks