Melvin, M. &. B. (2013). Principles of Economics (9th.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Melvin, Michael & Boyes. Principles of Economics. 9th. Canada: Cengage Learning, 2013.
Lua MLA (9ú heag.)Melvin, Michael & Boyes. Principles of Economics. 9th. Cengage Learning, 2013.
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