| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Classic Brain Teasers | 978-1-4027-1067-4 (1-4027-1067-4) | 2003 | Alan Stillson · Bernardo Recaman Santos |
| Classic Brainteasers | 978-1-58663-682-1 (1-58663-682-0) | 2002 | Alan Stillson · Barnardo R. Santos |
C.R. · C. Richards · K. C. · K. R. · K. Richards · Karen Richards