?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=J+G&rft.au=Ryan%2C+J+G&rft.aulast=Ryan&rft.atitle=Package+of+Practices+Approach+in+Adoption+of+High-Yielding+Varieties+an+Appraisal&rft.title=Economic+and+Political+Weekly&rft.date=1975&rft.volume=10&rft.pages=A101-A110&rft.issue=52&rft.genre=article