To cite LARF in publications use:

An W, Wang X (2016). “LARF: Instrumental Variable Estimation of Causal Effects through Local Average Response Functions.” Journal of Statistical Software, 71(1), 1-13.

Corresponding BibTeX entry:

  @Article{,
    title = {{LARF}: Instrumental Variable Estimation of Causal Effects
      through Local Average Response Functions},
    author = {Weihua An and Xuefu Wang},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {71},
    number = {1},
    pages = {1-13},
  }