To cite osmdata in publications use:

  Mark Padgham, Bob Rudis, Robin Lovelace, Maëlle Salmon (2017).
  “osmdata.” _Journal of Open Source Software_, *2*(14), 305.
  doi:10.21105/joss.00305 <https://doi.org/10.21105/joss.00305>,
  <https://joss.theoj.org/papers/10.21105/joss.00305>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {osmdata},
    author = {{Mark Padgham} and {Bob Rudis} and {Robin Lovelace} and {Maëlle Salmon}},
    journal = {Journal of Open Source Software},
    year = {2017},
    volume = {2},
    number = {14},
    pages = {305},
    month = {jun},
    publisher = {The Open Journal},
    url = {https://joss.theoj.org/papers/10.21105/joss.00305},
    doi = {10.21105/joss.00305},
  }