Ibad, MM, A. and SE, paulus 2011. PENGARUH ECONOMIC VALUE ADDED, DEGREE OF OPERATING LEVERAGE, DEGREE OF FINANCIAL LEVERAGE, DEGREE OF COMBINED LEVERAGE, RETURN ON EQUITY, DAN RETURN ON ASSETS TERHADAP RETURN SAHAM LQ 45 TAHUN 2005, 2006, 2007, DAN 2009. Jurnal Manajemen. 1, 1 (Nov. 2011).