?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Maclean&rft.au=Maclean%2C+M.&rft.aufirst=M.&rft.degree=Doctoral&rft.title=Optimism+in+education.&rft.inst=Institute+of+Education%2C+University+of+London&rft.tpages=0&rft.date=1979