Another great book about birth controll is by Kimberly Hann entitled "Life giving love". Kimberly Hann is the wife of Roman Catholic apoligist Scott Hann. Although I am Orthodox, this is an area which the orthodox and the RC's can unite on.
Mrs Hann explains her and her husbands journey in rejecting contraception (which happened to them as protestants), and lays down the the philisophical reasons, as well as the ancient church's teaching on contraceptives through the centuries, against contraceptives.
This book is a must read for any married couples, or anyone interested in this subject.