APA (7th ed.) Citation

Leuffen, D., Rittberger, B., & Schimmelfennig, F. (2013). Differentiated integration: Explaining variation in the European Union. Palgrave Macmillan.

Chicago Style (17th ed.) Citation

Leuffen, Dirk, Berthold Rittberger, and Frank Schimmelfennig. Differentiated Integration: Explaining Variation in the European Union. New York: Palgrave Macmillan, 2013.

MLA (9th ed.) Citation

Leuffen, Dirk, et al. Differentiated Integration: Explaining Variation in the European Union. Palgrave Macmillan, 2013.