| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Bulgarian Complete Symptothermal Guide: Ecological Birth Control & Pregnancy Achievement | 978-1-5192-3147-5 (1-5192-3147-4) | 2015 | R. Harri Wettstein |
| La Symptothermie Complete: La Contraception - ou Conception - Ecologique pour Tous! | 978-1-5003-9414-1 (1-5003-9414-9) | 2014 | R. Harri Wettstein · Pryska Ducoeurjoly |