Prapaipat Klungsupya. (1989) Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice. Mahidol University,:ม.ป.ท.Prapaipat Klungsupya. 1989. Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice. ม.ป.ท.:Mahidol University,;Prapaipat Klungsupya. Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice. ม.ป.ท.:Mahidol University, 1989. Print.