To cite multitable in publications use:

Steven C Walker, Guillaume Guenard, Peter Solymos, Pierre Legendre (2012). Multiple-Table Data in R with the multitable Package. Journal of Statistical Software, 51(8), 1-38. URL http://www.jstatsoft.org/v51/i08/.

Corresponding BibTeX entry:

  @Article{,
    title = {Multiple-Table Data in {R} with the {multitable} Package},
    author = {Steven C Walker and Guillaume Gu\'{e}nard and P\'{e}ter
      S\'{o}lymos and Pierre Legendre},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {51},
    number = {8},
    pages = {1--38},
    url = {http://www.jstatsoft.org/v51/i08/},
  }