To cite package 'PathNet' in publications use:

  Dutta B, Wallqvist A, and Reifman J. PathNet: A tool for pathway
  analysis using topological information. Source Code for Biology and
  Medicine 2012 Sep 24;7(1):10.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {PathNet: A tool for pathway analysis using topological information.},
    author = {Dutta B and Wallqvist A and Reifman J.},
    journal = {Source Code for Biology and Medicine},
    year = {2012},
    volume = {7},
    number = {1},
    pages = {10},
  }