Langley, K. M. (1969). The economics of the international petroleum industry and the economy of the Philippines. The Philippine Review of Business and Economics.
Chicago Style (17. basım) AtıfLangley, Kathleen M. "The Economics of the International Petroleum Industry and the Economy of the Philippines." The Philippine Review of Business and Economics 1969.
MLA (9th ed.) AtıfLangley, Kathleen M. "The Economics of the International Petroleum Industry and the Economy of the Philippines." The Philippine Review of Business and Economics, 1969.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..