Drake, St. Clair
Harper and Row, 1962
Buku Teks
Huxley, Aldous, 1894-1963
New York, Harper & Brothers, 1956
Buku Teks
edited by Robert Moore Fisher
Doubleday, 1955
Buku Teks
Wolfe, Gerard R.
McGraw-Hill, 1994
Buku Referensi
Jolly, D.
World Health Organization, 1992
Buku Teks