Prapaipat Klungsupya. 1989. Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice. Faculty of Graduate Studies, Mahidol University;
Prapaipat Klungsupya. (1989) Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice . Mahidol University/Bangkok.
Prapaipat Klungsupya. Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice. . Bangkok:Mahidol University, 1989.
Prapaipat Klungsupya. (1989) Acute and subacute toxicopathologic effects of the periwinkle plant : Catharanthus roseus G.don in rats and mice . Mahidol University/Bangkok.