Van der Ploeg, R., & Poelhekke, S. (2008). Volatility and the natural resource curse. University of Oxford.
Lua i Stíl Chicago (17ú heag.)Van der Ploeg, R., agus S. Poelhekke. Volatility and the Natural Resource Curse. University of Oxford, 2008.
Lua MLA (9ú heag.)Van der Ploeg, R., agus S. Poelhekke. Volatility and the Natural Resource Curse. University of Oxford, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.