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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিExpert Group Meeting on Population and Development Modelling (1979, Geneva). Population and Development Modelling: Proceedings of the United Nations/UNFPA Expert Group Meeting on Population and Development Modelling Geneva, 24-28 Sept. 1979. Conference publication. New York: United Nations, 1981.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিExpert Group Meeting on Population and Development Modelling (1979, Geneva). Population and Development Modelling: Proceedings of the United Nations/UNFPA Expert Group Meeting on Population and Development Modelling Geneva, 24-28 Sept. 1979. Conference publication. United Nations, 1981.