Alcantara, A. B. Problems of data collection for a dual records system in Manila and suburbs. Development and maintenance of a sample vital registration system in the Philippines : seminar proceedings, May 15-16, 1975..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Alcantara, Angustia B. "Problems of Data Collection for a Dual Records System in Manila and Suburbs." Development and Maintenance of a Sample Vital Registration System in the Philippines : Seminar Proceedings, May 15-16, 1975. .
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Alcantara, Angustia B. "Problems of Data Collection for a Dual Records System in Manila and Suburbs." Development and Maintenance of a Sample Vital Registration System in the Philippines : Seminar Proceedings, May 15-16, 1975., .
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.