National Power Corporation & Manila Electric Company. (1979). Historical electricity consumption in the Philippines. Power Sector Tariff Study, Corporate Planning, NPC.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Power Corporation و Manila Electric Company. Historical Electricity Consumption in the Philippines. Manila: Power Sector Tariff Study, Corporate Planning, NPC, 1979.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Power Corporation و Manila Electric Company. Historical Electricity Consumption in the Philippines. Power Sector Tariff Study, Corporate Planning, NPC, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.