Hill, R. C. (1973). Indicators of performance of educational systems. Paris: Organisation for Economic Co-operation and Development.
استشهاد بنمط شيكاغوHill, Roy Carr. Indicators of Performance of Educational Systems. Paris: Organisation for Economic Co-operation and Development, 1973.
MLA استشهادHill, Roy Carr. Indicators of Performance of Educational Systems. Paris: Organisation for Economic Co-operation and Development, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.