www.catholic.com/qa/guide-for-knowing-and-receiving-indulgences

Question:
What’s the most updated book about obtaining indulgences that a layperson can easily understand?
Answer:
The best guide is the Church’s official guide, i.e., the Manual of Indulgences or The Handbook of Indulgences,” which has also been traditionally known as The Enchiridion of Indulgences. The current edition was published in 1999.
You may also purchase your own copy of the Manual of Indulgences from Ascension Press.
You may also read a copy online.
For more on this subject, see our “Primer on Indulgences” tract.
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