English and Spanish. Also available is an accompanying "Reader's Journal" in English and Spanish. Our Sunday Visitor publishes a nice study guide that accompanies the USCCA.
(1) Each chapter prepares the reader by opening with personal witness/testimony in the form of an interesting biography of an American Catholic who lived an exemplary life. (2) Next, the chapter's topic is given in summarily in the form of a proclamation taken from the Catechism of the Catholic Church. (3) This is followed by a 5 to 10 page doctrinal explanation, subdivided by subtitles (including sidebars). (4) Discussion questions follow for personal or group reflection and application. The teaching is then restated in the form of concise doctrinal statements. (5) Finally, the reader is invited to celebrate the truth by engaging in a given meditation and prayer.
The USCCA is a tremendous resource that is easy to overlook. Don't underestimate its significance and usefulness!