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Kusumaningrum, Diana Hesti (2005) Analisis Pengaruh Bid – Ask Spread, Market Value dan Risk of Return Terhadap Holding Period Saham ( 50 Most Active Stock by Trading freuqency Periode Juni 2003 Sampai Mei 2004 ). Other thesis, Fakultas Ekonomi Dan Bisnis, UNIKA Soegijapranata.