To cite the PearsonICA package use:

Karvanen J., Koivunen V. (2002). Blind separation methods based on Pearson system and its extensions, Signal Processing 82(4), 663--673.
J. Karvanen (2008). PearsonICA R package version 1.2-3

Corresponding BibTeX entries:

  @Article{,
    title = {Blind separation methods based on Pearson system and its
      extensions},
    author = {Juha Karvanen and Visa Koivunen},
    journal = {Signal Processing},
    volume = {82},
    number = {4},
    pages = {663--673},
    year = {2002},
    url = {http://dx.doi.org/10.1016/S0165-1684(01)00213-4},
  }
  @Manual{,
    title = {PearsonICA: Independent component analysis using score
      functions from the Pearson system},
    author = {Juha Karvanen},
    year = {2008},
    note = {R package version 1.2-3},
  }