To cite package 'PresenceAbsence' in publications use:

Freeman, E. A. and Moisen, G. (2008). PresenceAbsence: An R Package for Presence-Absence Model Analysis. Journal of Statistical Software, 23(11):1-31. http://www.jstatsoft.org/v23/i11

Corresponding BibTeX entry:

  @Article{,
    author = {Elizabeth A. Freeman and Gretchen Moisen},
    title = {{PresenceAbsence}: An R Package for Presence Absence
      Analysis},
    journal = {Journal of Statistical Software},
    volume = {23},
    number = {11},
    pages = {1--31},
    year = {2008},
    url = {http://www.jstatsoft.org/v23/i11},
    note = {[email protected]},
  }