Mathur, Hari Mohan
Sage Publications, 1986
Buku Teks
Dixon, Chris J., author
Routledge, 2015
Buku Teks
edited by Carol Vlassoff, Barkat E. Khuda
International Development Research Center, 1988
Buku Teks
United Nations, 1983
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks