Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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