rees, c. j. v. (1964). some remarks on tinbergen's approach of project appraisal. the institute of national planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)rees, c. j. van. Some Remarks on Tinbergen's Approach of Project Appraisal. cairo: the institute of national planning, 1964.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)rees, c. j. van. Some Remarks on Tinbergen's Approach of Project Appraisal. the institute of national planning, 1964.