Young, H., & Burke, M. (2000). Competition and Custom in Economic Contracts: A Case Study of Illinois Agriculture. Department of Economics (Johns Hopkins University).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Young, H., و M. Burke. Competition and Custom in Economic Contracts: A Case Study of Illinois Agriculture. Department of Economics (Johns Hopkins University), 2000.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Young, H., و M. Burke. Competition and Custom in Economic Contracts: A Case Study of Illinois Agriculture. Department of Economics (Johns Hopkins University), 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.