APA (7e ed.) Bronvermelding

Bull, W. A. (2016). Optional instruments of European Union: A definitional, normative and explanatory study (1a. ed.). Intersentia Ltd.

Chicago (17e ed.) Bronvermelding

Bull, William A. Optional Instruments of European Union: A Definitional, Normative and Explanatory Study. 1a. ed. Cambridge: Intersentia Ltd, 2016.

MLA (9e ed.) Bronvermelding

Bull, William A. Optional Instruments of European Union: A Definitional, Normative and Explanatory Study. 1a. ed. Intersentia Ltd, 2016.