Interests: The European Parliament's Party Groups. John Peterson; Michael Shackleton (编). The Institutions ofthe European Union. Oxford University Press
measures ofthe European Union) EudraLex EUR-Lex(英语:EUR-Lex) 歐洲聯盟法律 歐洲聯盟指令列表(英语:Listof European Union directives) 歐洲聯盟規章(英语:Regulation (European Union)) 框架決定(英语:Framework
Karl Magnus; Raunio, Tapio. Political Parties in the European Union. Oxford Research Encyclopedia of Politics. 2019 [2024-09-17]. ISBN 978-0-19-022863-7