Don Richard Riso books in order

5 books in the catalogue, about 26 hours of reading in all; the shortest takes 2 hours and the longest 8 hours.

5 standalone books in the catalogue.

Standalone books

Personality Types 1987 8.1 h Understanding the Enneagram 1990 6.3 h Discovering Your Personality Type 1992 2.2 h Enneagram Transformations 1993 2.4 h The Wisdom of the Enneagram 1999 7.1 h