1S.Henig.Political Parties in the European Community[M].London:Allen and Unwin,1979; J.Pinder.European Community:The Building of a Union[M].Oxford:Oxford University Press,1991.
2Donatellam Viola.European Foreign Policy and the European Parliament in the 1990s[M].Ashgate,2000:20.
3See Amie Kreppel.The European Parliament and Supranational Party System[M].Cambridge:Cambridge University Press,2002:203.
