A Course in Miracles Official – edited version distributed by the Foundation for Inner Peace
This is the A Cours in Miracles Official version, which has been edited in 1970ies and is distributed by the Foundation of Inner Peace. Originally founded by Helen Schucman, the scribe and William Thetford the first editor.
If you are going to start on a completely fresh with the A Course in Miracles, I would recommend to start with this offiicial version, as the book has the 4 most important volumes included: The TEXT and the WORKBOOK, as well as the MANUAL FOR TEACHERS and CLARIFICATION OF TERMS.
Once you have worked your way through this, you can start on a more indepth journey and read the URTEXT and other versions which are out there.