Sopit Panyakhan. 2003. Cadmium and zinc toxicity on growth, chlorophyll contents and accumulation of Hydrocotyle umbellata L. Field of Study Environmental Biology, Mahidol University;
Sopit Panyakhan. (2003) Cadmium and zinc toxicity on growth, chlorophyll contents and accumulation of Hydrocotyle umbellata L. . Mahidol University/Bangkok.
Sopit Panyakhan. Cadmium and zinc toxicity on growth, chlorophyll contents and accumulation of Hydrocotyle umbellata L. . Bangkok:Mahidol University, 2003.
Sopit Panyakhan. (2003) Cadmium and zinc toxicity on growth, chlorophyll contents and accumulation of Hydrocotyle umbellata L. . Mahidol University/Bangkok.