To cite package ‘learnrbook’ in publications use:

  Aphalo P (2024). _learnrbook: Datasets for P. J. Aphalo's "Learn R"
  Book_. R package version 2.0.1,
  <https://CRAN.R-project.org/package=learnrbook>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{learnrbook}: Datasets for P. J. Aphalo's "Learn R" Book},
    author = {Pedro J. Aphalo},
    year = {2024},
    note = {R package version 2.0.1},
    url = {https://CRAN.R-project.org/package=learnrbook},
  }

  Aphalo P (2020). _Learn R: As a Language_, series R Series. Chapman
  and Hall/CRC, New York. ISBN 9780367182533, doi:10.1201/9780429060342
  <https://doi.org/10.1201/9780429060342>,
  <https://www.routledge.com/Learn-R-As-a-Language/Aphalo/p/book/9780367182533>.

A BibTeX entry for LaTeX users is

  @Book{,
    title = {Learn R: As a Language},
    booktitle = {Learn R: As a Language},
    author = {Pedro J. Aphalo},
    year = {2020},
    isbn = {9780367182533},
    doi = {10.1201/9780429060342},
    series = {R Series},
    publisher = {Chapman and Hall/CRC},
    address = {New York},
    url = {https://www.routledge.com/Learn-R-As-a-Language/Aphalo/p/book/9780367182533},
  }