Power, J. H. (1970). Protection and trade preferences. Institute of Economic Development and Research, School of Economics, University of the Philippines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPower, John H. Protection and Trade Preferences. [Quezon City]: Institute of Economic Development and Research, School of Economics, University of the Philippines, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPower, John H. Protection and Trade Preferences. Institute of Economic Development and Research, School of Economics, University of the Philippines, 1970.
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