To cite rddapp in publications use:

Ze Jin, Wang Liao, and Felix Thoemmes (2018). rddapp: Regression Discontinuity Design Application. R package version 1.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {rddapp: Regression Discontinuity Design Application},
    author = {Ze Jin and Wang Liao and Felix Thoemmes},
    year = {2018},
    note = {R package version 1.0.},
  }