Hubbard, R. G., & Duggan, W. R. (2009). The aid trap: Hard truths about ending poverty. Columbia Business School Pub..
Chicago-čujuhus (17. p.)Hubbard, R. Glenn, juo William R. Duggan. The Aid Trap: Hard Truths About Ending Poverty. New York: Columbia Business School Pub., 2009.
MLA-čujuhus (9. p.)Hubbard, R. Glenn, juo William R. Duggan. The Aid Trap: Hard Truths About Ending Poverty. Columbia Business School Pub., 2009.
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