Bull, W. A. (2016). Optional instruments of European Union: A definitional, normative and explanatory study (1a. ed.). Intersentia Ltd.
Citazione stile Chigago Style (17a edizione)Bull, William A. Optional Instruments of European Union: A Definitional, Normative and Explanatory Study. 1a. ed. Cambridge: Intersentia Ltd, 2016.
Citatione MLA (9a ed.)Bull, William A. Optional Instruments of European Union: A Definitional, Normative and Explanatory Study. 1a. ed. Intersentia Ltd, 2016.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.