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| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Competitive Intelligence: How to Acquire and Use Corporate Intelligenceand: How to Acquire and Use Corporate Intelligence and Counter-intelligence | 978-0-273-65928-0 (0-273-65928-6) | 2003 |
| Perfectly Legal Competitor Intelligence: How to Get It, Use It and Profit from It | 978-0-273-60153-1 (0-273-60153-9) | 1993 |