To cite package ‘ical’ in publications use:

Meissner P (2020). ical: 'iCalendar' Parsing. R package version 0.3.0, https://github.com/petermeissner/ical.

Corresponding BibTeX entry:

  @Manual{,
    title = {ical: 'iCalendar' Parsing},
    author = {Peter Meissner},
    year = {2020},
    note = {R package version 0.3.0},
    url = {https://github.com/petermeissner/ical},
  }