To cite rphylopic in publications, use the following citation:

  Gearty, W. and Jones, L.A. 2023. rphylopic: An R package for
  fetching, transforming, and visualising PhyloPic silhouettes. Methods
  in Ecology and Evolution, 14(11), 2700-2708. doi:
  10.1111/2041-210X.14221.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {rphylopic: An R package for fetching, transforming, and visualising PhyloPic silhouettes},
    author = {William Gearty and Lewis A. Jones},
    year = {2023},
    volume = {14},
    number = {11},
    pages = {2700-2708},
    journal = {Methods in Ecology and Evolution},
    doi = {10.1111/2041-210X.14221},
  }