World Health Organization (WHO)
World Health Organization, 2006
Buku Teks
edited by William Line and Margery R. King
University of Toronto Press, 1956
Buku Teks SO
Hughes, James P.
Kaiser Foundation International, 1972
Buku Teks
Pan American Health Organization
PAHO, 1992
Buku Teks
Sijthoff & Noordhoff, 1979
Buku Teks