Kahn, C. H. (1964). Business and professional income under the personal income tax. Princeton University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Kahn, Charles Harry. Business and Professional Income Under the Personal Income Tax. [Princeton, N.J.]: Princeton University Press, 1964.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Kahn, Charles Harry. Business and Professional Income Under the Personal Income Tax. Princeton University Press, 1964.