@unpublished{icrisat646,
          school = {Andhra Pradesh Agricultural Univerisity},
            year = {1990},
           title = {Mechanisms  of Resistance in Sorghum to Earhead Bug Calocoris Angustatus Lethierry},
          author = {A P Padma Kumari},
             url = {http://oar.icrisat.org/646/}
}