The book is written in the Greek language
Το έκτο κλειδί
For more information about its presentation and some excerpts (in Greek language):
Go to the Greek Home page and then
navigate to Παρουσίαση βιβλίου (Book presentation) for the
The sixth key
293 Σελίδες Α5
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If you want the book in printed form, contact the author.