Sapra, C. L. (1972). Measurement of educational wastage: A review of methodologies. National Council of Educational Research and Training.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sapra, C. L. Measurement of Educational Wastage: A Review of Methodologies. [New Delhi]: National Council of Educational Research and Training, 1972.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sapra, C. L. Measurement of Educational Wastage: A Review of Methodologies. National Council of Educational Research and Training, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.