linsel, h., & sack, k. (1965). relation of industrial pectoral plans to national plans. the institute of national planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)linsel, hermann, و kurt sack. Relation of Industrial Pectoral Plans to National Plans. cairo: the institute of national planning, 1965.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)linsel, hermann, و kurt sack. Relation of Industrial Pectoral Plans to National Plans. the institute of national planning, 1965.