A & C Black Publishers Ltd · Princeton University Press
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Pipits and Wagtails. | 978-0-691-08834-1 (0-691-08834-9) | 2003 | Per Alstrom |
| Pipits and Wagtails of Europe, Asia and North America: Identification and Systematics | 978-0-7136-5834-7 (0-7136-5834-7) | 2003 | Per Alstrom · et al. |