APA
"United Nations I. E. a. S. A. (. o., "United Nations I. E. a. S. A. (. o., . (1991). Ageing and urbanization. New: York U N USA.
Chicago
"United Nations International Economic and Social Affairs (Deptt of-)", "United Nations International Economic and Social Affairs (Deptt of-)", . 1991. Ageing and urbanization. New: York U N USA.
Harvard
"United Nations I. E. a. S. A. (. o., "United Nations I. E. a. S. A. (. o., . (1991). Ageing and urbanization. New: York U N USA.
MLA
"United Nations International Economic and Social Affairs (Deptt of-)", "United Nations International Economic and Social Affairs (Deptt of-)", . Ageing and urbanization. New: York U N USA. 1991.