Payne, R. J. Global Issues: Pearson New International Edition (4.). Pearson Education UK.
Lua i Stíl Chicago (17ú heag.)Payne, Richard J. Global Issues: Pearson New International Edition. 4. Pearson Education UK.
Lua MLA (8ú heag.)Payne, Richard J. Global Issues: Pearson New International Edition. 4. Pearson Education UK.
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