To cite package ‘autoharp’ in publications use:

  Gopal V, Seah S, Jeya Kumar V, Ang G (2021). _autoharp:
  Semi-Automatic Grading of R and Rmd Scripts_. R package version
  0.0.10, <https://CRAN.R-project.org/package=autoharp>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {autoharp: Semi-Automatic Grading of R and Rmd Scripts},
    author = {Vik Gopal and Samuel Seah and Viknesh {Jeya Kumar} and Gabriel Ang},
    year = {2021},
    note = {R package version 0.0.10},
    url = {https://CRAN.R-project.org/package=autoharp},
  }