To cite package ‘cowplot’ in publications use:

  Wilke C (2024). _cowplot: Streamlined Plot Theme and Plot Annotations
  for 'ggplot2'_. R package version 1.1.2,
  <https://github.com/wilkelab/cowplot>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {cowplot: Streamlined Plot Theme and Plot Annotations for 'ggplot2'},
    author = {Claus O. Wilke},
    year = {2024},
    note = {R package version 1.1.2},
    url = {https://github.com/wilkelab/cowplot},
  }