Population Center Foundation, National Population Library (Philippines), & Philippine Population Information Network Project. (1988). Union catalog of population literature in Philippine libraries: Third supplement. Population Center Foundation.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Population Center Foundation, National Population Library (Philippines), و Philippine Population Information Network Project. Union Catalog of Population Literature in Philippine Libraries: Third Supplement. Makati, Metro Manila: Population Center Foundation, 1988.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Population Center Foundation, et al. Union Catalog of Population Literature in Philippine Libraries: Third Supplement. Population Center Foundation, 1988.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.