To cite fechner in publications use:
Ünlü A, Kiefer T, Dzhafarov EN (2009). “Fechnerian Scaling in R: The Package fechner.” Journal of Statistical Software, 31(6), 1–24. https://www.jstatsoft.org/article/view/v031i06.
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 = {https://www.jstatsoft.org/article/view/v031i06},
}