| Auteur(s) | Falk, S. |
| Jaar | 1991 |
| Titel | A review of the scarce and threatened bees, wasps and ants of Great Britain. Research and survey in nature conservation 35. NCC, Peterborough. |
| Auteur(s) | Falk, S. |
| Jaar | 1991 |
| Titel | A review of the scarce and threatened bees, wasps and ants of Great Britain. Research and survey in nature conservation 35. NCC, Peterborough. |