Cita APA (7th ed.)

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.