To cite cocor in publications use:

Diedenhofen, B. (2013). cocor: Comparing correlations (Version 1.0-0). Available from http://r.birkdiedenhofen.de/pckg/cocor/

Corresponding BibTeX entry:

  @Manual{,
    title = {cocor: Comparing correlations},
    author = {Birk Diedenhofen},
    year = {2013},
    note = {(Version 1.0-0)},
    url = {http://r.birkdiedenhofen.de/pckg/cocor/},
  }