To cite package ‘SDT’ in publications use:

Uenlue A (2018). SDT: Self-Determination Theory Measures. R package version 1.0.0, https://CRAN.R-project.org/package=SDT.

Corresponding BibTeX entry:

  @Manual{,
    title = {SDT: Self-Determination Theory Measures},
    author = {Ali Uenlue},
    year = {2018},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=SDT},
  }