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

  Solymos, P and Lele, S R (2012). Global pattern and local variation
  in species-area relationships. Global Ecology and Biogeography 21,
  109-120. URL https://doi.org/10.1111/j.1466-8238.2011.00655.x

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Global pattern and local variation in species-area relationships},
    author = {P\'{e}ter S\'{o}lymos and Subhash R Lele},
    journal = {Global Ecology and Biogeography},
    year = {2012},
    volume = {21},
    pages = {109--120},
    url = {https://doi.org/10.1111/j.1466-8238.2011.00655.x},
  }