Puripus Soonthornnonda. 2014. Sources of heavy metals in surface sediments of the Nakhon Nayok River. ฺBangkok:Srinakharinwirot University;
Puripus Soonthornnonda. (2014) Sources of heavy metals in surface sediments of the Nakhon Nayok River (รายงานผลงานวิจัย). Srinakharinwirot University:ฺBangkok.
Puripus Soonthornnonda. Sources of heavy metals in surface sediments of the Nakhon Nayok River. ฺBangkok:Srinakharinwirot University, 2014.
Puripus Soonthornnonda. (2014) Sources of heavy metals in surface sediments of the Nakhon Nayok River (รายงานผลงานวิจัย). Srinakharinwirot University:ฺBangkok.