12. Andreas Fuchs, Peter Nunnenkamp, and Hannes Öhler (2013).Why Donors of Foreign Aid Do Not Coordinate: The Role of Competition for Export Markets and Political Support. Kiel Working Paper No. 1825. https://www.ifw-members.ifw-kiel.de/publications/why-donors-of-foreign-aid-do-not-coordinate-the-role-of-competition-for-export-markets-and-political-support/KWP_1825.pdf
12. Andreas Fuchs, Peter Nunnenkamp, និង Hannes Öhler (២០១៣). “ហេតុអ្វីម្ចាស់ជំនួយបរទេសមិនផ្តល់ការសម្របសម្រួល: តួនាទីនៃការប្រកួតប្រជែង សម្រាប់ការនាំចេញ និងការគាំទ្រនយោបាយទីផ្សារ. Kiel Working Paper No. 1825. https://www.ifw-members.ifw-kiel.de/publications/why-donors-of-foreign-aid-do-not-coordinate-the-role-of-competition-for-export-markets-and-political-support/KWP_1825.pdf