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by Bernhard Poerksen, Heinz Von Foerster
Used Softcover, 2002
by Bernhard Poerksen, Alison Rosemary Koeck (Translator), Wolfram Karl Koeck (Translator)
Used Softcover, 2022
by Bernhard Poerksen
Used Softcover, 2004
New Softcover, 2011
by Humberto R Maturana, Bernhard Poerksen, Wolfram Karl Koeck (Translator)
by Hanne Detel, Bernhard Poerksen
Used Softcover, 2014
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