PNG, I. (2013). Managerial Economics - 4th Edition. Routledge Taylor & Francis Group.
Lua i Stíl Chicago (17ú heag.)PNG, Ivan. Managerial Economics - 4th Edition. London: Routledge Taylor & Francis Group, 2013.
Lua MLA (9ú heag.)PNG, Ivan. Managerial Economics - 4th Edition. Routledge Taylor & Francis Group, 2013.
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