To cite treespace in publications, please use:

  T. Jombart, M. Kendall, J. Almagro-Garcia and C. Colijn. treespace:
  Statistical Exploration of Landscapes of Phylogenetic Trees.
  Molecular Ecology Resources, 17(6):1385-1392, 2017.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Thibaut Jombart and Michelle Kendall and Jacob Almagro-Garcia and Caroline Colijn},
    title = {treespace: Statistical Exploration of Landscapes of Phylogenetic Trees},
    journal = {Molecular Ecology Resources},
    volume = {17},
    issue = {6},
    pages = {1385-1392},
    publisher = {Wiley},
    year = {2017},
    url = {https://doi.org/10.1111/1755-0998.12676},
  }