To cite AER, please use:

Christian Kleiber and Achim Zeileis (2008). Applied Econometrics with R. New York: Springer-Verlag. ISBN 978-0-387-77316-2. URL http://CRAN.R-project.org/package=AER

Corresponding BibTeX entry:

  @Book{,
    title = {Applied Econometrics with {R}},
    author = {Christian Kleiber and Achim Zeileis},
    year = {2008},
    publisher = {Springer-Verlag},
    address = {New York},
    note = {{ISBN} 978-0-387-77316-2},
    url = {http://CRAN.R-project.org/package=AER},
  }