edited by Haile Mariam Kahssay and Peter Oakley
World Health Organization, 1999
Buku Teks
Kahssay, Haile Mariam
World Health Organization, 1998
Buku Teks
Abbatt, Fred
Macmillan, 1988
Buku Teks
Bernard, Miriam
Open University Press , 2000
Buku Teks
Issel, L. Michele
Jones & Bartlett Learning, 2014
Buku Teks