Costa, D. L. (1998). Hours of work and the fair labor standards act: A study of retail and wholesale trade, 1938-1950. National Bureau of Economic Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Costa, Dora L. Hours of Work and the Fair Labor Standards Act: A Study of Retail and Wholesale Trade, 1938-1950. Cambridge: National Bureau of Economic Research, 1998.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Costa, Dora L. Hours of Work and the Fair Labor Standards Act: A Study of Retail and Wholesale Trade, 1938-1950. National Bureau of Economic Research, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.