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https://books.google.de/books?id=GryqqV58cXcC&lpg<br /> | https://books.google.de/books?id=GryqqV58cXcC&lpg<br /> | ||
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''Universal Principles of Design''<br /> | |||
Lidwell, Holden, Butler <br /> | |||
https://books.google.de/books?id=l0QPECGQySYC <br /> |