compiled and prepared by Jilis A.J. Verheijen
Provinsi S.V.D., 1977
Buku Teks
Virtue and Company Limited , 1977
Buku Teks
Edited by A.D. Boardman
John Wiley & Sons, 1980
Buku Teks
Shackelford, James F., author
Gordon and Breach Science , 1999
Buku Teks
World Health Organization, 1955
Buku Teks