The current reference for the ‘NMMAPSdata’ package:

Peng RD, Welty LJ (2004). “The NMMAPSdata Package,” R News, 4 (2), 10--14.

Corresponding BibTeX entry:

  @Article{,
    title = {The {NMMAPSdata} Package},
    author = {Roger D. Peng and Leah J. Welty},
    journal = {R News},
    year = {2004},
    volume = {4},
    number = {2},
    pages = {10--14},
    url = {http://CRAN.R-project.org/doc/Rnews/},
  }