Please credit Sönke Ahrens and his 2017 book _How to Take Smart Notes_ for this system.
The credit goes to Luhmann. Ahrens wrote a book about Luhmann's system, but Ahrens' book was more about the practical side of study habits and the nature of knowledge as much as it was about the practical side of actually using a zettelkasten.
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The credit goes to Luhmann. Ahrens wrote a book about Luhmann's system, but Ahrens' book was more about the practical side of study habits and the nature of knowledge as much as it was about the practical side of actually using a zettelkasten.