Barnes, David W.
West Publishing , 1992
Buku Teks SO
edited by Sylvester E. Berki
Health, 1966
Buku Teks SO
Elzinga, Kenneth G.
Yale University Press, 1976
Buku Teks SO
Posner, Richard A.
Litle, Brown, 1980
Buku Teks SO
Little, Brown , 1980
Buku Teks