APA (7th ed.) Citation

Perera, P. (1989). Emerging issues of population aging in Sri Lanka. United Nations.

Chicago Style (17th ed.) Citation

Perera, P.D.A. Emerging Issues of Population Aging in Sri Lanka. New York: United Nations, 1989.

MLA (9th ed.) Citation

Perera, P.D.A. Emerging Issues of Population Aging in Sri Lanka. United Nations, 1989.