1. [1] N. F. Chen , R. Roll and S. A. Ross . Economic Forces and the Stock Market: Testing the APT and Alternative Asset Pricing Theories. Seminar on the Analysis of Security Prices, University of Chicago, May 1984.
2. [3] Engineering News Record. McGraw-Hill.
3. [5] I. Friend and M. Blume . Risk and the Long Run Rate of Return on the NYSE Common Stocks. Wharton School of Finance, Rodney L. White Center for Financial Research, Working Paper No. 18-72. 1972.