Ducanis, Alex J., author
Aspen Publication, 1979
Buku Teks
WHO, 1978
Buku Teks
edited by Hoarst Noack
University Park Press , 1980
Buku Teks
Akhtar, Shahid
International Development Research Centre, 1975
Buku Teks
edited by Gary E. Day and Sandra G. Leggat
Cambridge University Press, 2015
Buku Teks