To cite causaleffect in publications use:

Santtu Tikka, Juha Karvanen (2017). Identifying Causal Effects with the R Package causaleffect. Journal of Statistical Software, 76(12), 1-30.<doi:10.18637/jss.v076.i12>

Corresponding BibTeX entry:

  @Article{,
    title = {Identifying Causal Effects with the {R} Package
      {causaleffect}},
    author = {Santtu Tikka and Juha Karvanen},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {76},
    number = {12},
    pages = {1--30},
    doi = {10.18637/jss.v076.i12},
  }