@manual{icrisat1221,
       publisher = {International Crops Research Institute for the Semi-Arid Tropics},
            year = {1983},
            type = {Manual},
           title = {Striga identification and control handbook},
          author = {K V Ramaiah and C Parker and M J V Rao and L J Musselman},
             url = {http://oar.icrisat.org/1221/}
}