To cite package greekLetters in publications use:

  Rodrigues, K. A. S. (2024). greekLetters: Routines for Writing Greek
  Letters and Mathematical Symbols on the RStudio and RGui. Journal of
  Behavioral Data Science, 4(2), 1-6. DOI:
  https://doi.org/10.35566/jbds/rodrigues

A BibTeX entry for LaTeX users is

  @Article{,
    title = {greekLetters: Routines for Writing Greek Letters and Mathematical Symbols on the RStudio and RGui},
    journal = {Journal of Behavioral Data Science},
    author = {Kévin Allan Sales Rodrigues},
    year = {2024},
    volume = {4},
    number = {2},
    pages = {1–6},
    doi = {10.35566/jbds/rodrigues},
    url = {https://jbds.isdsa.org/jbds/article/view/92},
    abstractnote = {This is a brief description of the R package greekLetters. In short, greekLetters is a package for displaying Greek letters and various mathematical symbols in RStudio and RGui environments.},
  }