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 SO
Pan American Health Organization
PAHO, 1992
Buku Teks
Sijthoff & Noordhoff, 1979
Buku Teks
Indian Institute of Management, 1991
Buku Teks