To cite OneStep in publications use:

  Alexandre Brouste, Christophe Dutang, Darel Noutsa Mieniedou (2021).
  OneStep: Le Cam's One-step Estimation Procedure The R Journal, 13(1),
  366-377. DOI 10.32614/RJ-2021-044.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {OneStep: Le Cam's One-step Estimation Procedure},
    author = {Alexandre Brouste and Christophe Dutang and Darel {Noutsa Mieniedou}},
    journal = {The R Journal},
    year = {2021},
    volume = {13},
    number = {1},
    pages = {366--377},
    doi = {10.32614/RJ-2021-044},
  }

Please cite both the package and R when using them for data analysis.
See also ‘citation()’ for citing R.