APA (7 ম সংস্করণ) উদ্ধৃতি

Perera, P. (1989). Emerging issues of population aging in Sri Lanka. Economic and Social Commission for Asia and the Pacific, United Nations.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Perera, P.D.A. Emerging Issues of Population Aging in Sri Lanka. Economic and Social Commission for Asia and the Pacific, United Nations, 1989.