To cite package 'welo' in publications use:

  Vincenzo Candila (2023). welo: an R package for Weighted and Standard
  Elo Rates. Italian Journal of Applied Statistics 35(1), 1-18. DOI
  10.26398/IJAS.0035-005.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {welo: an R package for Weighted and Standard Elo Rates},
    author = {Vincenzo Candila},
    journal = {Italian Journal of Applied Statistics},
    year = {2023},
    volume = {35},
    number = {1},
    pages = {1-18},
    doi = {10.26398/IJAS.0035-005},
    url = {https://www.sa-ijas.org/ojs/index.php/sa-ijas/article/view/193},
  }