Robert J. Bianchi และ Michael E. Drew;Scott N. Pappas;Rene Tetteroo. (2013) BULLS, BEARS AND STRESS BETAS. <i>UTCC International Journal of Business and Economics</i>, <i>5</i>(2), 87-95.Robert J. Bianchi และ Michael E. Drew;Scott N. Pappas;Rene Tetteroo. "BULLS, BEARS AND STRESS BETAS". UTCC International Journal of Business and Economics 5 (2013):87-95.Robert J. Bianchi และ Michael E. Drew;Scott N. Pappas;Rene Tetteroo. BULLS, BEARS AND STRESS BETAS. University of the Thai Chamber of Commerce:ม.ป.ท. 2013.