by Kris Heggenhougen [and others]
Oxford University Press, 1987
Buku Teks
Akhtar, Shahid
International Development Research Centre, 1975
Buku Teks
Balldin, B.O.
African Medical and Research Foundation, 1975
Buku Teks
edited by Richard A. Crosby, Monica L. Wendel, Robin C. Vanderpool, Baretta R. Casey
Jossey-Bass, 2012
Buku Teks
WHO, 1978
Buku Teks