To cite idendro/idendr0 in publications use:

Sieger T, Hurley CB, FiĊĦer K, Beleites C (2017). “Interactive Dendrograms: The R Packages idendro and idendr0.” Journal of Statistical Software, 76(10), 1–22. doi:10.18637/jss.v076.i10.

Corresponding BibTeX entry:

    title = {Interactive Dendrograms: The {R} Packages {idendro} and
    author = {Tom\'a\v{s} Sieger and Catherine B. Hurley and Karel
      Fi\v{s}er and Claudia Beleites},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {76},
    number = {10},
    pages = {1--22},
    doi = {10.18637/jss.v076.i10},