Cita APA (7th ed.)

Sparks, N. (2011). The guardian. Sphere.

Cita Chicago (17th ed.)

Sparks, Nicholas. The Guardian. London: Sphere, 2011.

Cita MLA (8th ed.)

Sparks, Nicholas. The Guardian. Sphere, 2011.

Atenció: Aquestes cites poden no estar 100% correctes.