?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Preston&rft.aufirst=Christina&rft.au=Preston%2C+Christina&rft.date=2011&rft.title=Gaining+insight+into+educators'+understanding+of+digital+technologies%3A+three+models+for+the+analysis+of+multi-dimensional+concept+maps&rft.inst=Institute+of+Education%2C+University+of+London&rft.tpages=278&rft.degree=Doctoral