13. Ek Chanboreth and Sok Hach. “Aid Effectiveness in Cambodia.” Brookings Institute. December 2008. http://www.brookings.edu/~/media/research/files/papers/2008/12/cambodia-aid-chanboreth/12_cambodia_aid_chanboreth.pdf
13. ឯក ចាន់បូរ៉ែត និងសុខ ហាច. ធ្នូ ២០០៨. “ប្រសិទ្ធិភាពនៃជំនួយនៅកម្ពុជា.” វិទ្យាស្ថាន Brookings។ http://www.brookings.edu/~/media/research/files/papers/2008/12/cambodia-aid-chanboreth/12_cambodia_aid_chanboreth.pdf