@book{friedrich2008gehts,
  asin = {3451003848},
  author = {Friedrich, Gerhard and Bordihn, Andrea},
  ean = {9783451003844},
  edition = {5., Aufl.},
  interhash = {861a50d2323971d5fb3fc27bb1cb217f},
  intrahash = {5e179e92c96b0cc6e76b6aa9e91b3df7},
  isbn = {9783451003844},
  publisher = {Herder, Freiburg},
  title = {So geht's - Spass mit Zahlen und Mathematik im Kindergarten},
  url = {http://www.amazon.de/gp/product/3451003848/ref=s9_simh_gw_p14_d0_i5?pf_rd_m=A3JWKAKR8XB7XF&pf_rd_s=center-2&pf_rd_r=0V51DTET5FPYP30F9HNG&pf_rd_t=101&pf_rd_p=463375173&pf_rd_i=301128},
  year = 2008
}