To cite package ‘inline’ in publications use:

  Sklyar O, Eddelbuettel D, Francois R (2021). _inline: Functions to
  Inline C, C++, Fortran Function Calls from R_. R package version
  0.3.19.1, , <https://github.com/eddelbuettel/inline>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {inline: Functions to Inline C, C++, Fortran Function Calls from R},
    author = {Oleg Sklyar and Dirk Eddelbuettel and Romain Francois},
    year = {2021},
    note = {R package version 0.3.19.1, 
},
    url = {https://github.com/eddelbuettel/inline},
  }