To cite nlsMicrobio in publications use:

  F. Baty and M. L. Delignette-Muller (2013), nlsMicrobio: data sets
  and nonlinear regression models dedicated to predictive microbiology.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nlsMicrobio: data sets and nonlinear regression models dedicated to predictive microbiology},
    author = {{Florent Baty} and {Marie-Laure Delignette-Muller}},
    year = {2014},
    note = {R package version 0.0-1},
  }

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