APA Style
      BREGT, A., BULENS, J. (1992).
    Crop production potential of rural areas within the European Communities. 1: GIS and data model .
    Werur:
  WRR.
  
MLA Style
      BREGT, A.K.., BULENS, J.D..
    "Crop production potential of rural areas within the European Communities. 1: GIS and data model".
    
    Werur:
  WRR,
  1992.
  Text.