| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1993 | 978-0-9635474-1-5 | Karlen Evins | "I Didn't Know That" Vol. 2 |
| 2007 | 978-0-9635474-2-2 | Karlen Evins | I Didn't Know That: From "Ants in the Pants" to "Wet Behind the Ears" the Unusual Origins of the Things We Say |
| 2009 | 978-0-9635474-3-9 | '' | I Didn't Know That Comes From The Bible: From Sour Grapes to Feet Of Clay, The Biblical Origins Behind Our Everyday Words and Expressions |
| '' | 978-0-9635474-4-6 | '' | I Didn't Know That - Why We Say The Things We Say: From All Gussied Up to Under The Weather |