To cite vars in publications use:

Bernhard Pfaff (2008). VAR, SVAR and SVEC Models: Implementation Within R Package vars. Journal of Statistical Software 27(4). URL http://www.jstatsoft.org/v27/i04/.
Pfaff, B. (2008) Analysis of Integrated and Cointegrated Time Series with R. Second Edition. Springer, New York. ISBN 0-387-27960-1

For BibTex versions of citations use: toBibtex(citation('vars'))

Corresponding BibTeX entries:

  @Article{,
    title = {VAR, SVAR and SVEC Models: Implementation Within {R}
      Package {vars}},
    author = {Bernhard Pfaff},
    journal = {Journal of Statistical Software},
    year = {2008},
    volume = {27},
    number = {4},
    url = {http://www.jstatsoft.org/v27/i04/},
  }
  @Book{,
    title = {Analysis of Integrated and Cointegrated Time Series with
      R},
    author = {B. Pfaff},
    publisher = {Springer},
    edition = {Second},
    address = {New York},
    year = {2008},
    note = {ISBN 0-387-27960-1},
    url = {http://www.pfaffikus.de},
  }