@book{HoppeKr{\"a}merRensing2012,
  author    = {Hoppe, H. Ulrich and Kr{\"a}mer, Nicole and Rensing, Christoph},
  title     = {2. Workshop zu Web 2.0 in der beruflichen Weiterbildung im Rahmen der DeLFI 2012, Hagen},
  editor    = {Hoppe, H. Ulrich and Kienle, Andrea and Kr{\"a}mer, Nicole},
  publisher = {Fernuniversit{\"a}t Hagen},
  address   = {Hagen},
  pages     = {36},
  year      = {2012},
  language  = {de}
}
@book{HoppeKerresK{\"o}hler2011,
  author    = {Hoppe, Ulrich H. and Kerres, Michael and K{\"o}hler, Thomas},
  title     = {DeLFI 2011},
  editor    = {Friedrich, Steffen and Kienle, Andrea and Rohland, Holger},
  publisher = {TUDpress Verlag der Wissenschaften},
  address   = {Dresden},
  isbn      = {978-3-942710-36-7},
  year      = {2011},
  language  = {und}
}