Laing, J. E. (1972). Births averted by a multi-method family planning program. Family Planning Evaluation Office, Population Institute, University of the Philippines.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Laing, John E. Births Averted by a Multi-method Family Planning Program. [Manila]: Family Planning Evaluation Office, Population Institute, University of the Philippines, 1972.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Laing, John E. Births Averted by a Multi-method Family Planning Program. Family Planning Evaluation Office, Population Institute, University of the Philippines, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.