Ikerd, J. E. (2012). The essentials of economic sustainability. Kumarian Press.
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Chicago-čujuhus (17. p.)
Ikerd, John E. The Essentials of Economic Sustainability. Sterling, Va.: Kumarian Press, 2012.
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MLA-čujuhus (9. p.)
Ikerd, John E. The Essentials of Economic Sustainability. Kumarian Press, 2012.
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