Chalong Tonklongchan และ Wirunya Keawwattana. (2011) Development of natural rubber from water hyacinth for alternative sound absorption material. Kasetsart University,:ม.ป.ท.Chalong Tonklongchan และ Wirunya Keawwattana. 2011. Development of natural rubber from water hyacinth for alternative sound absorption material. ม.ป.ท.:Kasetsart University,;Chalong Tonklongchan และ Wirunya Keawwattana. Development of natural rubber from water hyacinth for alternative sound absorption material. ม.ป.ท.:Kasetsart University, 2011. Print.