To cite package 'tweedie' in publications use:

Peter K Dunn (2014). tweedie: Tweedie exponential family models. R package version 2.2.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {tweedie: Tweedie exponential family models},
    author = {Peter K Dunn},
    year = {2014},
    note = {R package version 2.2.1},
  }