Ellerman, D. (2000). The indirect approach. Office of the Senior Vice President and Chief Economist.
Chicago Style (17. basım) AtıfEllerman, David. The Indirect Approach. Washington, D.C: Office of the Senior Vice President and Chief Economist, 2000.
MLA (9th ed.) AtıfEllerman, David. The Indirect Approach. Office of the Senior Vice President and Chief Economist, 2000.
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