Cita APA (7a ed.)

Hondius, E., & Grigoleit, H. C. (2011). Unexpected circumstances in european contract law (1st published.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Hondius, Ewoud, y Hans Christoph Grigoleit. Unexpected Circumstances in European Contract Law. 1st published. Cambridge [etc.]: Cambridge University Press, 2011.

Cita MLA (9a ed.)

Hondius, Ewoud, y Hans Christoph Grigoleit. Unexpected Circumstances in European Contract Law. 1st published. Cambridge University Press, 2011.