U.S. Army. Corps of Engineers. Engineers Intelligence Section. (1977). Pre-war economic developments in the Philippine Islands [microform]. Photoduplication Service, University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)U.S. Army. Corps of Engineers. Engineers Intelligence Section. Pre-war Economic Developments in the Philippine Islands [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)U.S. Army. Corps of Engineers. Engineers Intelligence Section. Pre-war Economic Developments in the Philippine Islands [microform]. Photoduplication Service, University of the Philippines Library, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.