The American Public Health association, 1980
Buku Teks
Lindberg, Donald A.B., author
Charles C. Thomas, 1968
Buku Teks
American Public Health Association, 1973
Buku Teks
edited by Hoarst Noack
University Park Press , 1980
Buku Teks
edited by Gordon Mclachlan
Nuffield Provincial Hospital Trust, 1972
Buku Teks