To cite fechner in publications use:

Ali Uenlue, Thomas Kiefer, Ehtibar N. Dzhafarov (2009). Fechnerian Scaling in R: The Package fechner. Journal of Statistical Software, 31(6), 1-24. URL http://www.jstatsoft.org/v31/i06/.

Corresponding BibTeX entry:

  @Article{,
    title = {Fechnerian Scaling in {R}: The Package {fechner}},
    author = {Ali \"Unl\"u and Thomas Kiefer and Ehtibar N. Dzhafarov},
    journal = {Journal of Statistical Software},
    year = {2009},
    volume = {31},
    number = {6},
    pages = {1--24},
    url = {http://www.jstatsoft.org/v31/i06/},
  }