Chernecky, Cynthia C.
W.B. Saunders, 1997
Buku Referensi
Kee, Joyce LeFever
Pearson Prentice-Hall, 2005
Buku Teks
Levinson, Samuel A.
Lea & Febiger, 1962
Buku Teks
Dea S. Susanto
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2008
UI - Tesis Open
Watson, Juanita
Davis, 1995
Buku Teks