| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2008 | 978-0-9725918-5-0 | Karen DeFelice | Enzymes for Autism and Other Neurological Conditions (Updated Third Edition) |
| 2003 | 978-0-9725918-6-7 | Karen Defelice | Enzymes for Digestive Health and Nutritional Wealth: The Practical Guide for Digestive Enzymes |
| 2002 | 978-0-9725918-7-4 | Karen L. Defelice | Enzymes for Autism and other Neurological Conditions |
| 2006 | 978-0-9725918-9-8 | Karen DeFelice | Enzymes: Go With Your Gut: More Practical Guidelines For Digestive Enzymes |