?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=E.+E.&rft.au=Warren%2C+E.+E.&rft.aulast=Warren&rft.tpages=0&rft.title=An+Exploration+of+Case+Study+Methods+in+Evaluating+Secondary+Schools.&rft.inst=Institute+of+Education%2C+University+of+London&rft.degree=Doctoral&rft.date=1978