@InBook{Christenson:2011b,
  ALTauthor = 	 {Christenson, Dino P.},
  ALTeditor = 	 {Bertrand Badie and Dirk Berg-Schlosser and Leonardo Morlino},
  title = 	 {International Encyclopedia of Political Science},
  chapter = 	 {Correlation},
  publisher = 	 {Sage Publication},
  year = 	 {2011},
  OPTkey = 	 {},
  OPTvolume = 	 {},
  OPTnumber = 	 {},
  OPTseries = 	 {},
  OPTtype = 	 {},
  address = 	 {Thousand Oaks, CA},
  OPTedition = 	 {},
  OPTmonth = 	 {},
  Optpages = 	 {},
  OPTnote = 	 {},
  OPTannote = 	 {}
}