trusk, r. j. (1962). theoretical problems in regional income accounting. the institute of national planning.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)trusk, robert j. Theoretical Problems in Regional Income Accounting. cairo: the institute of national planning, 1962.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)trusk, robert j. Theoretical Problems in Regional Income Accounting. the institute of national planning, 1962.