Tapping task size of rubber estate in long sreng rubber plantation company (boeung ket), ទំហំរានចៀរជ័ររបស់កៅស៊ូកសិឧស្សាហកម្មនៅក្រុុមហ៊ុនចម្ការកៅស៊ូ ឡុុង ស្រេង (បឹងកេត) TENG BUNCHHAY; តេង ប៊ុនឆាយ RUB TEN 2014 B468 Or.1 Text xi, 49p. https://drive.google.com/file/d/1rYhAxLbdWrDY3irBk7mOHZ7nvYpFXjUu/view?usp=sharing