Power, J. H. (1979). Effective protection and the processing of primary commodities. School of Economics, University of the Philippines.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Power, John H. Effective Protection and the Processing of Primary Commodities. [Quezon City]: School of Economics, University of the Philippines, 1979.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Power, John H. Effective Protection and the Processing of Primary Commodities. School of Economics, University of the Philippines, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.