International Population Conference Liege & International Union for the Scientific Study of Population. (1973). International Population Conference = Congres international de la population: Liege, 1973. International Union for the Scientific Study of Population.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Population Conference Liege و International Union for the Scientific Study of Population. International Population Conference = Congres International De La Population: Liege, 1973. Liege, Belgium: International Union for the Scientific Study of Population, 1973.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Population Conference Liege و International Union for the Scientific Study of Population. International Population Conference = Congres International De La Population: Liege, 1973. International Union for the Scientific Study of Population, 1973.