Ball, Victoria Kloss, author
John Wiley & Sons, 1980
Buku Teks
Plain, Belva
Dell Publishing, 1980
Koleksi Publik
Columbia University Press, 1949
Buku Teks
Huxley, Aldous
New York, Harper & Brothers, 1956
Buku Teks
Jolly, D., author
World Health Organization, 1992
Buku Teks