| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| How to Collect Money That Is Owed to You | Paperback | 978-0-07-084948-8 | 1987 |
| How to collect money that is owed to you | Hardcover | 978-0-07-084578-7 | 1982 |
| Writing to Win | Paperback | 978-0-07-084942-6 | 1988 |
| Writing to Win | Hardcover | 978-0-07-707095-3 | 1988 |