Lihat Juga

• The Environment encyclopedia and directory
  Terbitan: (1994)
• The Encyclopedia of the environment
  oleh: Tudge, Colin
  Terbitan: (1988)
• The European Union encyclopedia and directory 1996
  Terbitan: (1996)
• The european communities encyclopedia and directory 1992
  Terbitan: (1991)
• The Europa union encyclopedia and directory 2009
  oleh: Garrard, Sheila
  Terbitan: (2008)