book.bib

@Book{xie2015,
  title = {Dynamic Documents with {R} and knitr},
  author = {Yihui Xie},
  publisher = {Chapman and Hall/CRC},
  address = {Boca Raton, Florida},
  year = {2015},
  edition = {2nd},
  note = {ISBN 978-1498716963},
  url = {http://yihui.org/knitr/},
}
@Book{Pena,
  title = {Problemas de la medición del bienestar y conceptos afines. Una aplicación al Caso Español},
  author = {Pena Trapero J. B.},
  publisher = {INE},
  address = Madrid},
  year = {1997},
}