Thanunya Saowapark และ Chakrit Sirisinha. (2012) A Study of viscoelastic properties of fly ash/natural rubber composites. Mahidol University:ม.ป.ท.Thanunya Saowapark และ Chakrit Sirisinha. 2012. A Study of viscoelastic properties of fly ash/natural rubber composites. ม.ป.ท.:Mahidol University;Thanunya Saowapark และ Chakrit Sirisinha. A Study of viscoelastic properties of fly ash/natural rubber composites. ม.ป.ท.:Mahidol University, 2012. Print.