To cite package ‘manipulate’ in publications use:

  Allaire J (2014). _manipulate: Interactive Plots for RStudio_. R
  package version 1.0.1,
  <https://CRAN.R-project.org/package=manipulate>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {manipulate: Interactive Plots for RStudio},
    author = {JJ Allaire},
    year = {2014},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=manipulate},
  }