Secrist, H. (1923). Competition in the retail distribution of clothing: A study of expense or "Supply" curves. Northwestern University, Bureau of Business Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Secrist, Horace. Competition in the Retail Distribution of Clothing: A Study of Expense or "Supply" Curves. Chicago, Ill.: Northwestern University, Bureau of Business Research, 1923.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Secrist, Horace. Competition in the Retail Distribution of Clothing: A Study of Expense or "Supply" Curves. Northwestern University, Bureau of Business Research, 1923.
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