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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিCommission of the European Communities. Directorate-General for Energy. Energy in Europe: Economic Foundations for Energy Policy. Luxembourg: Office for Official Publications of the European Communities, 1999.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিCommission of the European Communities. Directorate-General for Energy. Energy in Europe: Economic Foundations for Energy Policy. Office for Official Publications of the European Communities, 1999.
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