To cite package ‘r2rtf’ in publications use:

  Wang S, Ye S, Anderson KM, Zhang Y (2020). “r2rtf-an R Package to
  Produce Rich Text Format (RTF) Tables and Figures.” In _PharmaSUG_.
  <https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf>.

A BibTeX entry for LaTeX users is

  @InProceedings{,
    title = {{r2rtf}---an {R} Package to Produce {Rich Text Format} ({RTF}) Tables and Figures},
    author = {Siruo Wang and Simiao Ye and Keaven M Anderson and Yilong Zhang},
    booktitle = {PharmaSUG},
    year = {2020},
    url = {https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf},
  }