To cite R2HTML in publications use:

Lecoutre E (2003). “The R2HTML Package.” R News, 3(3), 33–36. https://cran.r-project.org/doc/Rnews/Rnews_2003-3.pdf.

See citation() for citing R itself.

Corresponding BibTeX entry:

  @Article{,
    title = {The {R2HTML} Package},
    author = {Eric Lecoutre},
    journal = {R News},
    year = {2003},
    volume = {3},
    number = {3},
    pages = {33--36},
    month = {December},
    url = {https://cran.r-project.org/doc/Rnews/Rnews_2003-3.pdf},
  }