Taking Charge of Your Fertility
From SFSI
Taking Charge of Your Fertility: The Definitive Guide to Natural Birth Control, Pregnancy Achievement, and Reproductive Health by Toni Weschler, published by Collins [Buy]
A thorough guide to the fertility awareness method (FAM) which women can use to recognize and track their fertility cycles whether they're trying to conceive or trying to avoid pregnancy.
ISBN 0060881909