University of Chicago , 1963
Buku Teks
Danton, J. Periam, author
American Library Association, 1973
Buku Teks
Gordon, Bernard K., author
Prentice-Hall, 1966
Buku Teks
World Health Organization
World Health Organization, 1981
Buku Teks
Rasmussen, Sandra, author
F.A. Davis, 1972
Buku Teks