[.ca] The Ovulation Method: Natural Family Planning (ISBN 0814610110)

Simple and quick:
You can read this book in 30 minutes and understand it. After ordering this book I was recommended "Taking Charge of your Fertility" by a friend. Taking Charge is more complete but uses this information, however. By the time my amazon.com shipment arrived with the second book, I was already pregnant from the first time trying The Ovulation Method (we had tried to get pregnant approximately a year before getting this book). So read it. You can also use it to avoid getting pregnant. It works!