They are per couple.
There are two types of books:
- The complete workbook in color, very nice, a keepsake for the couple
- the Notebook, a cheaper black and white version of the workbook.
The notebook doesn't include the documents at the end of each session, documents that the couples are supposed to read in between sessions.
Instructors will just email these documents to the couples between each session (the documents are on the Instructors CD).