R. P. · R. R. · Robert P. · Robert R.
Faber and Faber · Penguin Books Ltd
| title | media type | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|---|
| Laughter: A Scientific Investigation | Paperback | 978-0-14-100225-5 (0-14-100225-5) | 2001 |
| Laughter: A Scientific Investigation | " | 978-0-571-19189-5 (0-571-19189-4) | 2000 |
| Laughter: A Scientific Investigation | Hardcover | 978-0-670-89375-1 (0-670-89375-7) | 2000 |