On vision and colors by Arthur Schopenhauer and Color sphere ...
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To Open the Sky
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Dissertation on the Art of Combinations
Gottfried Wilhelm Leibniz
Smarter Wal-Mart Defenders, Please!
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The Mystery of Money: Beyond Greed and Scarcity
Bernard A. Lietaer
Rethinking Money: How New Currencies Turn Scarcity into Prosperity
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The Future of Money
New Money for a New World
People Money: The Promise of Regional Currencies
Bernard A. Lietaer & Margrit Kennedy & John Rogers
Building the Structure of the New Society Within the Shell of ...