To cite hier.part in publications use:

Nally RM, Walsh CJ (2004). “Hierarchical partitioning public-domain software.” Biodiversity and Conservation, 13, 659–-660. https://search.proquest.com/openview/6f19c4d612b6cf75b106c479e7084a58/1.

Corresponding BibTeX entry:

  @Article{,
    title = {Hierarchical partitioning public-domain software.},
    author = {Ralph Mac Nally and Christopher J Walsh},
    journal = {Biodiversity and Conservation},
    year = {2004},
    volume = {13},
    pages = {659–-660.},
    url =
      {https://search.proquest.com/openview/6f19c4d612b6cf75b106c479e7084a58/1},
  }