Rubber tapping quality in krek company (cambodia) co., ltd, គុណភាពចៀរជ័រនៅក្រុុមហ៊ុនក្រែក(​ ខេមបូឌា ) ខូអិលធីឌី CHHIM DAVUTH; ឈឹម ដាវុធ RUB CHH 2014 B468 Or.1 Text xiii,55p. https://drive.google.com/file/d/1VDUV_vF3b8dQ3B7_LysUqx1VJo6AM61W/view?usp=sharing