Payne, R. J. Global Issues: Pearson New International Edition (4.). Pearson Education UK.
Cita Chicago (17th ed.)Payne, Richard J. Global Issues: Pearson New International Edition. 4. Pearson Education UK.
Cita MLA (8th ed.)Payne, Richard J. Global Issues: Pearson New International Edition. 4. Pearson Education UK.
Atenció: Aquestes cites poden no estar 100% correctes.