To cite BCEA in publications use:

  Baio et al (2017). Bayesian Cost Effectiveness Analysis with the R
  package BCEA. Springer, New York, NY. doi: 10.1007/978-3-319-55718-2,
  URL: http://www.springer.com/us/book/9783319557168/.

A BibTeX entry for LaTeX users is

  @Book{,
    title = {Bayesian Cost-Effectiveness Analysis with the R package BCEA},
    publisher = {Springer},
    year = {2017},
    author = {{Baio} and {G} and {Berardi} and {A} and {Heath} and {A}},
    month = {Jul},
    address = {New York, NY},
    url = {http://www.springer.com/us/book/9783319557168},
    doi = {10.1007/978-3-319-55718-2},
    isbn = {978-3-319-55718-2},
  }