Dayal, R. (1981). An integrated system of world models: With separate models for economic growth, population and labour force, energy, food and agriculture, machinery and equipment, and raw materials. North-Holland Pub. Co. ; sole distributors for U.S.A. and Canada, Elsevier North-Holland.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dayal, Ram. An Integrated System of World Models: With Separate Models for Economic Growth, Population and Labour Force, Energy, Food and Agriculture, Machinery and Equipment, and Raw Materials. Amsterdam ; New York : New York: North-Holland Pub. Co. ; sole distributors for U.S.A. and Canada, Elsevier North-Holland, 1981.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dayal, Ram. An Integrated System of World Models: With Separate Models for Economic Growth, Population and Labour Force, Energy, Food and Agriculture, Machinery and Equipment, and Raw Materials. North-Holland Pub. Co. ; sole distributors for U.S.A. and Canada, Elsevier North-Holland, 1981.