To cite Rcpp in publications use:

Eddelbuettel D, François R (2011). “Rcpp: Seamless R and C++ Integration.” Journal of Statistical Software, 40(8), 1–18. doi: 10.18637/jss.v040.i08, http://www.jstatsoft.org/v40/i08/.

Eddelbuettel D (2013). Seamless R and C++ Integration with Rcpp. Springer, New York. doi: 10.1007/978-1-4614-6868-4, ISBN 978-1-4614-6867-7.

Eddelbuettel D, Balamuta JJ (2017). “Extending extitR with extitC++: A Brief Introduction to extitRcpp.” PeerJ Preprints, 5, e3188v1. ISSN 2167-9843, doi: 10.7287/peerj.preprints.3188v1, https://doi.org/10.7287/peerj.preprints.3188v1.

Corresponding BibTeX entries:

  @Article{,
    title = {{Rcpp}: Seamless {R} and {C++} Integration},
    author = {Dirk Eddelbuettel and Romain Fran\c{c}ois},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {40},
    number = {8},
    pages = {1--18},
    url = {http://www.jstatsoft.org/v40/i08/},
    doi = {10.18637/jss.v040.i08},
  }

  @Book{,
    title = {Seamless {R} and {C++} Integration with {Rcpp}},
    author = {Dirk Eddelbuettel},
    publisher = {Springer},
    address = {New York},
    year = {2013},
    note = {ISBN 978-1-4614-6867-7},
    doi = {10.1007/978-1-4614-6868-4},
  }

  @Article{,
    title = {{Extending extit{R} with extit{C++}: A Brief Introduction
      to extit{Rcpp}}},
    author = {Dirk Eddelbuettel and James Joseph Balamuta},
    journal = {PeerJ Preprints},
    year = {2017},
    month = {aug},
    volume = {5},
    pages = {e3188v1},
    issn = {2167-9843},
    url = {https://doi.org/10.7287/peerj.preprints.3188v1},
    doi = {10.7287/peerj.preprints.3188v1},
  }