Even though I'm just 29, I've been in Catholic Education Programs involving Junior High and High School Students for over 15 years now, and when I first read this book, I made it one of the required readings for at least all of the catechists that I have since instructed, especially those that, over the years, have not had adequate religious instruction over the years. These are the ones that complain about reading the bible, left wondering what the point of it is, and in some cases not knowing what the Catechism is. But this book uses larger fonts, pictures, figures, and various facts about church history and saints that make Catholicism so real and interesting. And being a visual person, I love the figures explaining the Reformation, differences we have with the Protestant faith, and the sadness that came from this considering the movement originated from a sorrowful story about difficulties in politics, sinfulness, and poor practices at the time, much as the American Catholic Church has been experiencing in the past decade. But this also explains how the foundations of our faith are what we need to remember and that sinners of our faith should not deter us from the "one holy, catholic and apostolic Church" (Nicene Creed) we declare we believe in.
It's hard to summarize the elements of the Catholic faith in this book, but for the catechists that I instruct , making sure that they are responsible in understanding the faith that they are to state they believe in upon receiving the Sacrament of Confirmation, I make them read every topic we cover in our instruction, knowing that there is a chapter or section that covers this in "The Catholic Source Book." I also recommend "The Catholic Faith Handbook for Youth," by Brian Singer-Towns, et al.