| Avaa | Bergerud, Arthur T. toim. Gratson, Michael W. toim.
| Adaptive strategies and population ecology of Northern grouse. Volume 2 : Theory and Synthesis | | kirja | ekologia, metsäkanat | University of Minnesota Press | Minneapolis | 1988 | 419 | 0-8166-1471-7 | | | C-Lintutiede, linnut |