Oxford Univ. Press , 1966
Buku Teks
World Health Organization, 1975
Buku Teks
Gertler, Paul, 1955-
The John Hopkins University Press , 1990
Buku Teks
Springer Publ ., 1974
Buku Teks
Akhtar, Shahid
International Development Research Centre, 1975
Buku Teks