Professor Michael Nobel has recently published two books on Praedicate Evangelium. In the first book, Dr. Nobel offers a systematic overview of both Pastor Bonus (1988) and Praedicate Evangelium (2022). The second book offers a commentary on the changes that came with the new Apostolic Constitution. They can be purchased through Amazon.
Pastor Bonus - Praedicate Evangelium: Synopsis
Pastor Bonus - Praedicate Evangelium: Commentary