To cite LearnGeom in publications use:

Briz-Redon A, Serrano-Aroca A (2018). “Novel pedagogical tool for simultaneous learning of plane geometry and R programming.” Research Ideas and Outcomes, 4, e25485. https://riojournal.com/articles.php?id=25485.

Corresponding BibTeX entry:

  @Article{,
    title = {Novel pedagogical tool for simultaneous learning of plane
      geometry and R programming},
    author = {Alvaro Briz-Redon and Angel Serrano-Aroca},
    journal = {Research Ideas and Outcomes},
    year = {2018},
    volume = {4},
    pages = {e25485},
    url = {https://riojournal.com/articles.php?id=25485},
  }