Phelan, William (2012). "What Is Sui Generis About the European Union? Costly International Cooperation in a Self-Contained Regime". International Studies Review14 (3): 367–385. doi:10.1111/j.1468-2486.2012.01136.x. ISSN1468-2486.
Phelan, William (2012). "What Is Sui Generis About the European Union? Costly International Cooperation in a Self-Contained Regime". International Studies Review14 (3): 367–385. doi:10.1111/j.1468-2486.2012.01136.x. ISSN1468-2486.