To cite moult in publications use:

Birgit Erni, Bo T. Bonnevie, Hans-Dieter Oschadleus, Res Altwegg, Les G. Underhill (2013). moult: An R Package to Analyze Moult in Birds. Journal of Statistical Software, 52(8), 1-23. URL http://www.jstatsoft.org/v52/i08/.

Corresponding BibTeX entry:

  @Article{,
    title = {{moult}: An {R} Package to Analyze Moult in Birds},
    author = {Birgit Erni and Bo T. Bonnevie and Hans-Dieter Oschadleus
      and Res Altwegg and Les G. Underhill},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {52},
    number = {8},
    pages = {1--23},
    url = {http://www.jstatsoft.org/v52/i08/},
  }