APA

Klabbers J., Peters A. & Ulfstein G. (2010). The constitutionalization of international law. Oxford: Oxford University Press.

Chicago

Klabbers Jan, Peters Anne and Ulfstein Geir. 2010. The constitutionalization of international law. Oxford: Oxford University Press.

Harvard

Klabbers J., Peters A. and Ulfstein G. (2010). The constitutionalization of international law. Oxford: Oxford University Press.

MLA

Klabbers Jan, Peters Anne and Ulfstein Geir. The constitutionalization of international law. Oxford: Oxford University Press. 2010.