@book{ BA8638409X,
  author    = "Müller, Ulrich",
  title     = "Social life and social knowledge : toward a process account of development",
  publisher = "Lawrence Erlbaum Associates",
  year      = "2008",
  series    = "The Jean Piaget Symposium series",
  number    = "",
  URL       = "https://ci.nii.ac.jp/ncid/BA8638409X"
}