Power, J. H. (1970). Protection and trade preferences. Institute of Economic Development and Research, School of Economics, University of the Philippines.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPower, John H. Protection and Trade Preferences. [Quezon City]: Institute of Economic Development and Research, School of Economics, University of the Philippines, 1970.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPower, John H. Protection and Trade Preferences. Institute of Economic Development and Research, School of Economics, University of the Philippines, 1970.
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