McDonald, Ruth, author
Open University Press, 2002
Buku Teks
Santerre, Rexford E., author
South-Western Cengage Learning, 2013
Buku Teks
Supinus, author
2013
UI - Tesis (Membership)
Baah, Asamoah
World Health Organization, 1995
Buku Teks
Mooney, Gavin H., author
Harvester Wheatsheaf, 1994
Buku Teks