Intal, P. S. (1989). Population, welfare and rural development. Population / Development Planning and Research Project of the National Economic and Development Authority.
Cita Chicago (17th ed.)Intal, Ponciano S. Population, Welfare and Rural Development. s.l: Population / Development Planning and Research Project of the National Economic and Development Authority, 1989.
Cita MLA (9th ed.)Intal, Ponciano S. Population, Welfare and Rural Development. Population / Development Planning and Research Project of the National Economic and Development Authority, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.