Pitayapan Pattanaphonpaibool. (1993) Chemical modifications of ecdysteroids. Ramkhamhaeng University,:ม.ป.ท.Pitayapan Pattanaphonpaibool. 1993. Chemical modifications of ecdysteroids. ม.ป.ท.:Ramkhamhaeng University,;Pitayapan Pattanaphonpaibool. Chemical modifications of ecdysteroids. ม.ป.ท.:Ramkhamhaeng University, 1993. Print.