Cita APA (7th ed.)

Sampedro, R., & Hillyard, S. (2004). Global issues (1a. ed.). Oxford University Press.

Cita Chicago (17th ed.)

Sampedro, Ricardo, i Susan Hillyard. Global Issues. 1a. ed. Oxford: Oxford University Press, 2004.

Cita MLA (9th ed.)

Sampedro, Ricardo, i Susan Hillyard. Global Issues. 1a. ed. Oxford University Press, 2004.