| Publication Type: | Journal Article |
| Year of Publication: | 1961 |
| Authors: | Bock, WJ |
| Journal: | The Auk |
| Volume: | 78 |
| Issue: | 3 |
| Date Published: | 1961 |
| ISBN Number: | 00048038 |
| Keywords: | Corvidae, Garrulus, Garrulus glandarius, Perisoreus, Perisoreus canadensis |
| URL: | http://www.jstor.org/stable/4082273 |
| Short Title: | The Auk |
Taxonomic name: