To cite package ‘rIntervalTree’ in publications use:

  Pu S (2019). _rIntervalTree: An Interval Tree Tool for Real Numbers_.
  R package version 0.1.0,
  <https://CRAN.R-project.org/package=rIntervalTree>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rIntervalTree: An Interval Tree Tool for Real Numbers},
    author = {Shuye Pu},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=rIntervalTree},
  }