What about Potency-a Comprehensive Guide to Homeopathic Potency & Dosage

There are  very interesting case examples, and great information about when to change potency and how. It covers aspects of case management which are important.

The book also  includes interviews with Jeremy Sherr, Nancy Herrick, Francis Treuherz, Ian Watson, Robin Logan, Alize Timmerman, Roger Savage, Anthony Bickley, John Morgan (Helios), Mike Bridger. They all give intersting perspectives about potency.