To cite the package 'nlrwr' in publications use:

Ritz, C. & Streibig, J. C. (2008) Nonlinear Regression with R Springer, New York

Corresponding BibTeX entry:

  @Book{,
    title = {Nonlinear Regression with R},
    author = {C. Ritz and J. C. Streibig},
    address = {New York},
    publisher = {Springer},
    year = {2008},
  }