Intal, P. S. (1989). Population, welfare, and rural development. Population/Development Planning and Research Project, National Economic and Development Authority.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Intal, Ponciano S. Population, Welfare, and Rural Development. [Manila]: Population/Development Planning and Research Project, National Economic and Development Authority, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Intal, Ponciano S. Population, Welfare, and Rural Development. Population/Development Planning and Research Project, National Economic and Development Authority, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.