Engle, R. F., & Lange, J. (1997). Measuring, forecasting and explaining time varying liquidity in the stock market. National Bureau of Economic Research.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Engle, Robert F., و Joe Lange. Measuring, Forecasting and Explaining Time Varying Liquidity in the Stock Market. Cambridge: National Bureau of Economic Research, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Engle, Robert F., و Joe Lange. Measuring, Forecasting and Explaining Time Varying Liquidity in the Stock Market. National Bureau of Economic Research, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.