Competition Review. (2011). General Knowledge year book 2011. Competition Review Pvt. Ltd.
Cita Chicago (17th ed.)Competition Review. General Knowledge Year Book 2011. New Delhi: Competition Review Pvt. Ltd, 2011.
Cita MLA (9th ed.)Competition Review. General Knowledge Year Book 2011. Competition Review Pvt. Ltd, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.