Philippines. Department of Trade and Tourism. (1972). Integrated development and promotion of Philippine tourism and foreign trade: Background material. The Department.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines. Department of Trade and Tourism. Integrated Development and Promotion of Philippine Tourism and Foreign Trade: Background Material. [Manila]: The Department, 1972.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines. Department of Trade and Tourism. Integrated Development and Promotion of Philippine Tourism and Foreign Trade: Background Material. The Department, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.