?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Michael&rft.aulast=Nagel&rft.au=Nagel%2C+Michael&rft.isbn=9780195519655&rft.btitle=Understanding+development+and+learning%3A+Implications+for+teaching&rft.date=2016&rft.genre=book