Pica / Christopher Helm · Yale University Press
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Swifts | 978-1-873403-83-9 (1-873403-83-6) | 2000 |
| Swifts | 978-1-873403-31-0 (1-873403-31-3) | 1995 |
| Swifts: A Guide to the Swifts and Treeswifts of the World, Second Edition | 978-0-300-07936-4 (0-300-07936-2) | 1995 |