APA (7th ed.) Citation

Smith, M., Keukeleire, S., & Vanhoonacker, S. (2016). The diplomatic system of the European Union: Evolution, change and challenges. Routledge.

Chicago Style (17th ed.) Citation

Smith, Michael, Stephan Keukeleire, and Sophie Vanhoonacker. The Diplomatic System of the European Union: Evolution, Change and Challenges. London [etc.]: Routledge, 2016.

MLA (9th ed.) Citation

Smith, Michael, et al. The Diplomatic System of the European Union: Evolution, Change and Challenges. Routledge, 2016.