| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Jack-O'-Lantern: The Strange History of the Halloween Pumpkin from Ancient Times to the Present | 978-1-7287-1222-2 (1-7287-1222-X) | 2018 |
| Success Secrets of Sherlock Holmes: Life Lessons from the Master Detective | 978-0-399-53698-4 (0-399-53698-1) | 2011 |
| What Would Lincoln Do?: Lincoln's Most Inspired Solutions to Challenging Problems and Difficult Situations | 978-1-4022-1790-6 (1-4022-1790-0) | 2009 |
Independently published · Penguin Putnam · Sourcebooks