There are 2 books by Walter Witzel on BookOrb. A strong starting point is Lehren des Beweisens im Mathematikunterricht (1981). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Walter Witzel written?
BookOrb lists 2 books by Walter Witzel.
Where should I start with Walter Witzel?
A good starting point is Lehren des Beweisens im Mathematikunterricht (1981).
What is the Walter Witzel books in order list?
In publication order: 1. Lehren des Beweisens im Mathematikunterricht (1981), 2. Renewable Energy - the Facts (2013).