C.H. · Connie & Alan Higley · Connie and Alan Higley
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Aromatherapy A-Z | 978-1-56170-796-6 (1-56170-796-1) | 2001 | Alan Higley |
| Quick Reference Guide for Using Essential Oils 11th Edition November 2008 | 978-0-9706583-7-1 (0-9706583-7-0) | 2008 | |
| Quick Reference Guide for Using Essential Oils | 978-1-937702-26-7 (1-937702-26-X) | 2014 | Alan Higley |