Tarimo, E., author
World Health Organization, 1991
Buku Teks
Charles Webster
Open University Press, 2001
Buku Teks
de Freitas, Chris R., author
Springer, 2012
eBooks
Ellis, Janice Rider, author
J.B. Lippincot, 2000
Buku Teks
Ellis, Janice Rider, author
J.B. Lippincott, 1995
Buku Teks