Perera, P. (1989). Emerging issues of population aging in Sri Lanka. Economic and Social Commission for Asia and the Pacific, United Nations.
Citace podle Chicago (17th ed.)Perera, P.D.A. Emerging Issues of Population Aging in Sri Lanka. Bangkok: Economic and Social Commission for Asia and the Pacific, United Nations, 1989.
Citace podle MLA (9th ed.)Perera, P.D.A. Emerging Issues of Population Aging in Sri Lanka. Economic and Social Commission for Asia and the Pacific, United Nations, 1989.
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