To cite 'dclone' in publications use with package version number:

  Peter Solymos (2010). dclone: Data Cloning in R. The R Journal 2(2),
  29-37. https://journal.r-project.org/.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {dclone: Data Cloning in {R}},
    author = {P\'{e}ter S\'{o}lymos},
    journal = {The R Journal},
    year = {2010},
    volume = {2},
    number = {2},
    pages = {29--37},
    url = {https://journal.r-project.org/},
  }