Sachs , I. (1965). Foreign Trade and Economic Development of Underdeveloped Countries. Asia Publishing House.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sachs , Ignacy. Foreign Trade and Economic Development of Underdeveloped Countries. India: Asia Publishing House, 1965.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Sachs , Ignacy. Foreign Trade and Economic Development of Underdeveloped Countries. Asia Publishing House, 1965.