Kooijmans, H.G. Schermers and M. van Leeuwen Boomkamp, International Organization and Integration (The Hague: Nijhoff, 1984), II.K.3.2.a.
Kapteyn, P.H. Lauwaars, P.H. Kooijmans, H.G. Schermers and M. van Leeuwen Boomkamp, International Organization and Integration (The Hague: Nijhoff, 1984), II.K.3.2.a.