To cite 'hddtools' in publications, please use:

  Vitolo, C. (2017, January). Hddtools: hydrological data discovery
  tools. The Journal of Open Source Software, 2(9).
  doi:10.21105/joss.00056

A BibTeX entry for LaTeX users is

  @Article{,
    doi = {10.21105/joss.00056},
    year = {2017},
    month = {01},
    publisher = {The Open Journal},
    volume = {2},
    number = {9},
    author = {{Vitolo} and {Claudia}},
    title = {hddtools: Hydrological Data Discovery Tools},
    journal = {The Journal of Open Source Software},
  }