To cite the alr3 package in publications use:

Sanford Weisberg (2005). Applied Linear Regression, Third Edition. Hoboken NJ: Wiley. URL: http://www.stat.umn.edu/alr

Corresponding BibTeX entry:

  @Book{,
    title = {Applied Linear Regression},
    edition = {Third},
    author = {Sanford Weisberg},
    year = {2005},
    publisher = {Wiley},
    address = {Hoboken {NJ}},
    url = {http://www.stat.umn.edu/alr},
  }