Krishna, K. (2000). If at first you don't succeed ..: Profits, prices and market structure in a model of quality with unknowable consumer heterogeneity. National Bureau of Economic Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Krishna, Kala. If at First You Don't Succeed ..: Profits, Prices and Market Structure in a Model of Quality with Unknowable Consumer Heterogeneity. Cambridge: National Bureau of Economic Research, 2000.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Krishna, Kala. If at First You Don't Succeed ..: Profits, Prices and Market Structure in a Model of Quality with Unknowable Consumer Heterogeneity. National Bureau of Economic Research, 2000.
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