edited by Hoarst Noack
University Park Press , 1980
Buku Teks SO
Ducanis, Alex J.
Aspen, 1979
Buku Teks SO
Aspen Publication, 1995
Buku Teks
King, Maurice Henry
Oxford University Press, 1978
Buku Teks SO
by World Health Organization
World Health Organization, 1988
Buku Teks SO