To cite QPAD in publications use:

  Solymos, P., Matsuoka, S. M., Bayne, E. M., Lele, S. R., Fontaine,
  P., Cumming, S. G., Stralberg, D., Schmiegelow, F. K. A. & Song, S.
  J., 2013. Calibrating indices of avian density from non-standardized
  survey data: making the most of a messy situation. Methods in Ecology
  and Evolution, 4, 1047--1058.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Calibrating indices of avian density from non-standardized survey data: making the most of a messy situation.},
    author = {{Solymos} and {P.} and {Matsuoka} and S. M. and {Bayne} and E. M. and {Lele} and S. R. and {Fontaine} and {P.} and {Cumming} and S. G. and {Stralberg} and {D.} and {Schmiegelow} and F. K. A. and {Song} and S. J.},
    journal = {Methods in Ecology and Evolution},
    year = {2013},
    volume = {4},
    pages = {1047--1058},
  }