Handwerk, Berlin 2008, S. 20. ISBN 978-3-8270-0033-0.
"Every good craftsman conducts a dialogue between concrete practices and thinking; this dialogue evolves into sustaining habits, and these habits establish a rhythm between problem solving and problem finding.” - The Craftsman (2008), p. 18 books.google http://books.google.de/books?id=52jRePjZ8-oC&pg=PT18
