Phiphatsara Sukprasong และ Nonsee Nimitsiriwat. (2013) Studies on color stability of butterfly pea extract and preparation of poly(vinyl alcohol) films entrapped with butterfly pea extract. King Mongkut’s University of Technology Thonburi:ม.ป.ท.Phiphatsara Sukprasong และ Nonsee Nimitsiriwat. 2013. Studies on color stability of butterfly pea extract and preparation of poly(vinyl alcohol) films entrapped with butterfly pea extract. ม.ป.ท.:King Mongkut’s University of Technology Thonburi;Phiphatsara Sukprasong และ Nonsee Nimitsiriwat. Studies on color stability of butterfly pea extract and preparation of poly(vinyl alcohol) films entrapped with butterfly pea extract. ม.ป.ท.:King Mongkut’s University of Technology Thonburi, 2013. Print.