The Billings Ovulation Method;
Highly acclaimed and scientifically researched natural method. Fully compatible with Church teaching.
The official site for the Billings Ovulation Method is; www.thebillingsovulationmethod.org
Watch; the BillingsLIFE introductory film on U Tube; Audio-Visual Presentation of the Billings Ovulation Method
https://youtu.be/8XmJrESeL3I
NAOMI (UK) ‘National Association of Ovulation Method Instructors (Billings) for instructors for talks in the U.K.
W.O.M.B. World Organisation Ovulation Method Billings