Gaster, Lucy, 1940-, author
Open University Press, 1995
Buku Teks
Sax, Sidney
Allen & Unwin , 1990
Buku Teks
Edited by Robert F. Durant, Jennifer R.S. Durant
CRC Press, 2013
Buku Teks
McElroy, Michael B., author
Prentice-Hall, 1996
Buku Teks
World Health Organization
World Health Organization, 2006
Buku Teks