@article{Kruk:2015,
  author  = "M. Kruk",
  title   = "Practicing the English Present Simple Tense in Active Worlds",
  journal = "International Journal of Computer-Assisted Language Learning and Teaching (IJCALLT)",
  volume  = "Vol. 5",
  number  = "Issue 4",
  pages   = "52--65",
  year    = "2015",
}