R.K. · Robert D. Keppel · Robert Kaplow · Robert Kappel · Robert Koppel · Robert Kubal
| title | media type | ISBN-13 | year of publica- tion |
|---|---|---|---|
| Serial Murder: Future Implications for Police Investigations | Paperback | 978-1-928704-18-8 | 2000 |
| Signature Killers | " | 978-1-4165-8579-4 | 2007 |
| Signature Killers | Mass Market Paperback | 978-0-671-00130-8 | 1997 |
| The Riverman: Ted Bundy and I Hunt for the Green River Killer | " | 978-0-7434-6395-9 | 2004 |
| The Riverman: Ted Bundy and I Hunt for the Green River Killer | " | 978-0-671-86763-8 | 1995 |