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Hanushek, Eric A. and Lindseth, Alfred A. (2009) Schoolhouses, Courthouses, and Statehouses : Solving the Funding-Achievement Puzzle in America's Public Schools. Princeton University Press. ISBN 9781400830251
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Kuru, Ahmet T. (2009) Secularism and State Policies toward Religion : The United States, France, and Turkey. Cambridge University Press, Cambridge, United Kingdom. ISBN 9780511532795
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Mann, Robert (2009) An Introduction to Particle Physics and the Standard Model. 1st Edition ed. CRC Press, Boca Raton. ISBN 9781420083002
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Proukaki, Elena Katselli (2009) The Problem of Enforcement in International Law: Countermeasures, the non-injured state and the idea of international community. 1st Edition ed. Routledge, London. ISBN 9780203865569