Curtin, J., & Walker, G. (1972). Population projections: A manual for planners. Ann Foras Forbartha, St. Martin's House.
Cita Chicago (17th ed.)Curtin, J.V, i G.A Walker. Population Projections: A Manual for Planners. Dublin: Ann Foras Forbartha, St. Martin's House, 1972.
Cita MLA (9th ed.)Curtin, J.V, i G.A Walker. Population Projections: A Manual for Planners. Ann Foras Forbartha, St. Martin's House, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.