@manual{icrisat2462,
          number = {Skill development series no. 13},
          author = {B Diwakar and D L Oswalt},
            year = {1992},
           title = {Research planning and data handling },
       publisher = {International Crops Research Institute for the Semi-Arid Tropics},
            type = {Manual},
             url = {http://oar.icrisat.org/2462/}
}