Duncan, R. K. (1907). The chemistry of commerce: A simple interpretation of some new chemistry in its relation to modern industry. Harper & brothers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Duncan, Robert Kennedy. The Chemistry of Commerce: A Simple Interpretation of Some New Chemistry in Its Relation to Modern Industry. New York and London: Harper & brothers, 1907.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Duncan, Robert Kennedy. The Chemistry of Commerce: A Simple Interpretation of Some New Chemistry in Its Relation to Modern Industry. Harper & brothers, 1907.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.