@article{Kruk:2016,
  author  = "M. Kruk",
  title   = "Variations in motivation, anxiety and boredom in learning English in Second Life",
  journal = "The EUROCALL Review",
  volume  = "Vol. 23",
  number  = "No. 1",
  pages   = "25--39",
  year    = "2016",
}