To cite package RArcInfo in publications use:

  V. Gómez-Rubio and A. López-Quílez (2005). RArcInfo: Using GIS data
  with R. Computers & Geosciences 3(8), 1000-1006.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {V. Gómez-Rubio and A. López-Quílez},
    title = {RArcInfo: Using GIS data with R},
    journal = {Computers \& Geosciences},
    year = {2005},
    volume = {31},
    number = {8},
    pages = {1000-1006},
    month = {october},
  }