To cite package 'Rwave' in publications use:

  Brandon Whitcher and Christian Gunning (2011). Rwave: Time-frequency
  analysis of 1-D signals. R package version 1.25-2.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Rwave: Time-frequency analysis of {1-D} signals},
    author = {Brandon Whitcher and Christian Gunning},
    year = {2011},
    note = {R package version 1.25-2},
  }